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 tristate buffers.

What is used to enable the tristate buffer that is connected to $D_2?$

none of these

S$3$ S$2\text{'}$ S$1$ S$0$

S$3\text{'}$ S$2\text{'}$ S$1$ SO

S$3\text{'}$ S$2$ S$1\text{'}$ SO$\text{'}$

S$3$ S$2$ S$1\text{'}$ so

S$3\text{'}$ S$2$ S$1\text{'}$ S$0$

S$3$ S$2\text{'}$ S$1$ SO$\text{'}$