Information:  - The Shenzhen Metro is the subway or underground system for the city of Shenzhen in Guangdong province, China. The system opened on 28 December 2004, making Shenzhen the sixth city in mainland China to have a subway after Beijing, Tianjin, Shanghai, Guangzhou, and Wuhan. The Shenzhen Metro currently has eight lines, 166 stations, and of total trackage in operation. The network underwent rapid expansion prior to the 2011 Summer Universiade, opening of tracks in June 2011. The system underwent another major expansion with the opening of Line 11 in June 2016 and both Lines 7 and 9 in October 2016 shortly making the system the third longest in China before Guangzhou Metro regained the position in December 2016. Two new lines and extension of several existing lines are underway with a long term goal of and of lines by 2030.  - Hong Kong, officially the Hong Kong Special Administrative Region of the People's Republic of China, is an autonomous territory on the Pearl River Delta of East Asia. Macau lies across the delta to the west, and the Chinese province of Guangdong borders the territory to the north. With a total land area of and a population of over 7.3 million of various nationalities, it ranks as the world's fourth most densely populated sovereign state or territory.  - China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381 billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower.  - Shenzhen is a major city in Guangdong Province, China. The city is located immediately north of Hong Kong Special Administrative Region and holds sub-provincial administrative status, with powers slightly less than a province.  - Mainland China, also known as the Chinese mainland or simply the mainland, is the geopolitical area under the direct jurisdiction of the People's Republic of China (PRC). It generally excludes the Special Administrative Regions of Hong Kong and Macau; however, it usually includes Hainan. The term "mainland China", which avoids calling the area simply "China" and thereby recognizing the founding of the PRC as "the" "China", was coined by the Kuomintang (KMT) after receiving control of Taiwan from Japan after World War II. By 1949, the KMT-led Republic of China (ROC) government was defeated in the Chinese Civil War in mainland China and fled to the island of Taiwan where the KMT pledged to "retake the Mainland". The KMT considers both sides of the Taiwan Strait (including Taiwan), as (one) "China" and one country, whereas Taiwan's Democratic Progressive Party (DPP) considers only mainland China as "China" and Taiwan (ROC) as "Taiwan" and maintains that they are different countries.  - Line 4 ( Longhua ) of the Shenzhen Metro runs northward from Futian Checkpoint to Qinghu . The line serves Futian District and the eastern part of Bao'an District ( in particular , Longhua Subdistrict ) of Shenzhen . The line originally used 4 - car trains , making it extremely crowded although it still carried over 250,000 people daily peaking at 516,100 on 5 May 2014 . Stations feature electronic passenger information systems which display estimated train arrival times . When the second phase of the line opened in 2011 , there were only 8 trains which were completely unable to meet passenger demand . By 2012 , 24 trains were in service . On 26 January 2014 , the first 6 - car train entered service , and as of 30 January 2015 all trains are 6 cars ; 2 months earlier than planned . The line is coloured red , although it was originally marked in blue until 1 July 2010 .  - Guangdong (Simplified ) is a province on the South China Sea coast of the People's Republic of China. Formerly romanised as Canton or Kwangtung, Guangdong surpassed Henan and Sichuan to become the most populous province in China in January 2005, registering 79.1 million permanent residents and 31 million migrants who lived in the province for at least six months of the year; the total population was 104,303,132 in the 2010 census, accounting for 7.79 percent of Mainland China's population. The provincial capital Guangzhou and economic hub Shenzhen are among the most populous and important cities in China. The population increase since the census has been modest, the province at 2014 end had 107,240,000 people.  - The 2011 Summer Universiade, the XXVI Summer Universiade, was hosted in Shenzhen, Guangdong, China.    After reading the paragraphs above, we are interested in knowing the entity with which 'line 4' exhibits the relationship of 'inception'. Find the answer from the choices below.  Choices: - 1  - 1949  - 2004  - 2005  - 2010  - 2011  - 2014  - 7  - january 2005  - june 2011
A:
2004