Say you have a pointer int$*$ p $=$ &a$,$ and that int a is at address $0$x$1000.$ What's the value of p$+4?$

A: $0$x$1004$

B: you shouldn't compute that $--$ that's asking for a segmentation fault

C: it depends on the size of an int on your system

D: $0$x$1020,$ since ints are $8$ bytes on a $64-$bit computer