The device that can act as a complete electronic circuit is

The device that can act as a complete electronic circuit is
A Zener diode
B Junction diode
C Integrated circuit
D Junction transistor

Detailed Solution

An integrated circuit (IC) is an entire circuit, consisting of many passive components (resistors, capacitors) and active components (diodes, transistors), fabricated on a single small block (chip) of semiconductor.
So a single IC can act as a complete electronic circuit, such as an amplifier or a logic circuit.
A zener diode, a junction diode and a junction transistor are single components that need other components to form a working circuit.
Hence the device is the integrated circuit.

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