What is the output waveform $$V_{o}$$ for a sinusoidal input of peak-peak amplitude of 4V. Assume that Z1 and Z2 are two identical Zener diodes of 4.7V, and R1 = 10kohm and R2 = 20kohm.

A

Same as input

B

Sinusoidal waveform with 5.4V peak

C

Sinusoidal waveform clamped to $$\pm$$ 4.7V

D

Sinusoidal waveform clamped to $$\pm$$ 5.4V