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The $I-V$ characteristics of the zener diodes $D1\:\text{and}\:D2$ are shown in Figure I. These diodes are used in the circuit given in Figure II. If the supply voltage is varied from $0$ to $100$ V,then breakdown occurs in

1. $D1$ only
2. $D2$ only
3. both $D1$ and $D2$
4. none of $D1$  and $D2$

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