Please answer the following question: Information:  - Electronics is the science of controlling electrical energy electrically, in which the electrons have a fundamental role. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes, integrated circuits, associated passive electrical components, and interconnection technologies. Commonly, electronic devices contain circuitry consisting primarily or exclusively of active semiconductors supplemented with passive elements; such a circuit is described as an electronic circuit.  - Plot. This story portrays Susono Musubi, a young police officer in a post-apocalyptic subterranean city that's thriving with activity, who is investigating recent child abductions. She finds a heavily toned down, sword-like Gravitational Beam Emitter as well as other elements that take different forms in the later publication (for example, Silicon life).  - Digital electronics or digital (electronic) circuits are electronics that handle digital signals (discrete bands of analog levels) rather than by continuous ranges as used in analog electronics. All levels within a band of values represent the same information state. Because of this discretization, relatively small changes to the analog signal levels due to manufacturing tolerance, signal attenuation or noise do not leave the discrete envelope, and as a result are ignored by signal state sensing circuitry.  - Analogue electronics ( or analog in American English ) are electronic systems with a continuously variable signal , in contrast to digital electronics where signals usually take only two levels . The term `` analogue '' describes the proportional relationship between a signal and a voltage or current that represents the signal . The word analogue is derived from the Greek word  ( analogos ) meaning `` proportional '' .  - In mathematics, discretization concerns the process of transferring continuous functions, models, and equations into discrete counterparts. This process is usually carried out as a first step toward making them suitable for numerical evaluation and implementation on digital computers. Processing on a digital computer requires another process called quantization. Dichotomization is the special case of discretization in which the number of discrete classes is 2, which can approximate a continuous variable as a binary variable (creating a dichotomy for modeling purposes, as in binary classification).     After reading the paragraphs above, we are interested in knowing the entity with which 'analogue electronics' exhibits the relationship of 'part of'. Find the answer from the choices below.  Choices: - city  - classification  - electronic circuit  - electronics  - life  - mathematics  - police  - process  - science  - sword
A:
electronic circuit