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(D) The given circuit consists of two buffers (or $NOT$ gates connected in series to act as buffers) followed by a $NAND$ gate.$1$. The input $A$ pass

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$NAND$

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(D) The given circuit consists of two buffers (or $NOT$ gates connected in series to act as buffers) followed by a $NAND$ gate.$1$. The input $A$ passes through a buffer, so the output is $A$.$2$. The input $B$ passes through a buffer, so the output is $B$.$3$. These two outputs $A$ and $B$ are fed into a $NAND$ gate.$4$. The output of a $NAND$ gate with inputs $A$ and $B$ is $Y = \overline{A \cdot B}$.$5$. This is the definition of a $NAND$ gate.Therefore, the circuit is equivalent to a $NAND$ gate.

The output of the following circuit is equivalent to which gate?

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