The symbolic form of the following circuit is (where $p, q$ and $r$ represent switches $s_{1}, s_{2}$ and $s_{3}$ which are closed respectively):

  • A
    $(p \wedge q) \vee [\sim p \wedge (\sim q \vee p \vee r)] \equiv \ell$
  • B
    $[(p \vee q) \wedge \sim p] \vee [\sim p \vee q \vee r] \equiv \ell$
  • C
    $(p \wedge q) \vee [\sim p \wedge (\sim q \vee p \vee r)] \equiv \ell$
  • D
    $(p \wedge q) \vee \sim p \vee [\sim p \vee p \vee r] \equiv \ell$

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