Given: A $16$:$1$ multiplexer has data inputs $D_0,D_1,$dots,$D_{15},$ select inputs $S_{3\text{:}0},$ and

output Y$.$ It is implemented using $2-$level logic. One of the AND gates in the

implementation is shown below:

What is the first input to the AND gate $($indicated by a question mark$)?$

D$12$

D$10$

D$3$

D$5$

none of these

D$14$

D$1$