How would you go about writing a function size$\_$t number$\_$of$\_$numbers$($int$*$ numbers$),$ to determine the size of a dynamically$-$allocated array of ints?

A: Every array carries its size, so you can just return numbers$->$size.

B: You can use sizeof$()$ to find the size of an array.

C: You can't do that, since C passes arrays as pointers to the initial element of the array.

D: Start at the beginning of the array and walk through the elements until you find a null element.