The simplified switching circuit for the following circuit is (Assume the circuit consists of two switches $S_1$ and $S_2$ in parallel, connected in series with a switch $S_3$):

  • A
    $A$ series combination of $S_3$ and $(S_1 \text{ or } S_2)$
  • B
    $A$ parallel combination of $S_3$ and $(S_1 \text{ and } S_2)$
  • C
    $A$ series combination of $S_1$ and $(S_2 \text{ or } S_3)$
  • D
    $A$ parallel combination of $S_1$ and $(S_2 \text{ or } S_3)$

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