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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 $(iv)$

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