Which one of the following statements allocates enough space to hold an array of 10 integers that are initialized to 0 ?

A) int *ptr = (int *) calloc(10,sizeof(int));
b) int *ptr = (int *) alloc( 10*sizeof(int));
c) int *ptr = (int *) malloc( 10*sizeof(int));
d) int *ptr = (int *)calloc(10*sizeof(int));