Answer: C
The symbol of a zener diode is the one with the bent bar at the cathode, shown as (C). In the symbol, the triangle shows the direction of forward current and the bar at the cathode has its ends turned in the shape of a Z to show the breakdown action.
Symbol (A) is a light-emitting diode with arrows leaving the diode, (B) is a photodiode with arrows going towards it, and (D) is an ordinary junction diode with a straight bar. So the third option is the answer.
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