$(12)$ Which of the following instructions sets the least significant four bits in register $$11$ and leaves remaining bits unchanged?

A$)$ ori St$1,$ St$1,0$x$0000$FFFF

C$)$ andi $$11,$$$t1,00000000F$

B$1$ ori $S+1,S+1,00000000F$

D$)$ andi St$1,$ $$11,0$x$0000$FFFF