Why not option c ?

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Consider a multiplexer with $X$ and $Y$ as data inputs and $Z$ the as control input. $Z=0$ selects input $X$, and $Z=1$ selects input $Y$. What are the connections required to realize the 2-variable Boolean function $f=T+R$, without using any additional hardware?

- R to X, 1 to Y, T to Z
- T to X, R to Y, T to Z
- T to X, R to Y, 0 to Z
- R to X, 0 to Y, T to Z

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