Figure shows four electronic switches (i), (ii), (iii) and

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Figure shows four electronic switches (i), (ii), (iii) and (iv). Which of the switches can block voltages of either polarity (applied between terminals ‘a’ and ‘b’) when the active device is in the OFF state?

1. (i), (ii) and (iii)
2. (ii), (iii) and (iv)
3. (ii) and (iii)
4. (i) and (iv)

Correct Option: C

Switch (i) and (ii) blocks the voltage in only forward direction while switch (ii) and (iii) blocks the voltage in both derictions i.e. forward as were as in reverse directions.