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A: Half wave rectifier
B: Full wave rectifier
C: ac voltage stabilizer
D: dc voltage stabilizer
Correct Option is: (C) ac voltage stabilizer
The current in the zener diode changes according to wide range of values of load resistance, but the voltage across it does not change .
So, this is the reason that the output voltage across the zener diode is a regulated voltage.
Hence, zener diode is used as voltage stabilizer.