void copy_array(int *src, int *dest, int n){
     int i;
     
     for (i = 0; i < n; i++){
	 dest[i] = src[i];
     }
}

What would be the effect of the call:
A. copy_array(a+1, a, 999)
B. copy_array(a, a+1, 999)

C. Which one is faster? Why?