Below is the prototype for a function that takes two pointers to integer variables as its parameters. The purpose of the function is to exchange the values stored in the integer variables to which the two pointers point. Consider the proposed implementation code for this function and select all options that would correctly accomplish the intent of the function.
void exchange ( int p, int q );

A) void exchange( int p, int q ) {
p = q;
q = p;}
B) void exchange( int p, int q ) {
p = q;
q = p;}
C) void exchange( int p, int q ) {
int temp = *p;
p = q;
*q = temp;}
D) void exchange( int p, int q ) { int *temp = p; p = q; q = temp;}
E) void exchange( int p, int q ){ int temp = p; p = q; q = *temp;}