$(12)$ Which of the following instructions sets the least significant four bits in register $$+1$ and leaves remaining bits unchanged?

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

C$)$ andi $t$1,$ $t$1,000000000F$

B$)$ ori St$1,$ St$1,00000000F$

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