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Two Zener diodes (A and B ) having bre...

Two Zener diodes (A and B ) having breakdown voltage of 6 V and 4 V respecitvely , are connected as shown in the circuit below . The output voltage `V_(0)` variation with input voltage linearly increasing with time is given by :
`(V_("imput") = 0 V at t = 0 )` ( figure are qualitative )

A

B

C

D

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