(B) An $AND$ gate performs the logical multiplication operation. Its output is $1$ only if all its inputs are $1$. In terms of switching circuits,an $

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is equivalent to a series switching circuit

(B) An $AND$ gate performs the logical multiplication operation. Its output is $1$ only if all its inputs are $1$. In terms of switching circuits,an $AND$ gate is equivalent to two switches connected in series. If both switches are closed (input $1$),current flows (output $1$). If either switch is open (input $0$),the circuit is broken (output $0$).