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The truth table

X Y (X,Y)
0 0 0
0 1 0
1 0 1
1 1 1

represents the Boolean function

1. $X$
2. $X + Y$
3. $X \oplus Y$
4. $Y$
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Whenever $X$ is true $(X,Y)$ is true and whenever $X$ is false $(X,Y)$ is false, so the answer is (A) $X$.
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