If $c$ denotes the contradiction,then the dual of the compound statement $\sim p \wedge (q \vee c)$ is:
- A$\sim p \vee (q \wedge t)$
- B$\sim p \wedge (q \vee t)$
- C$p \vee (\sim q \vee t)$
- D$\sim p \vee (q \wedge c)$
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If $p$: switch $S_1$ is closed,$q$: switch $S_2$ is closed,$r$: switch $S_3$ is closed,then the symbolic form of the following switching circuit is equivalent to:
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