What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    int a = 9;
    int & aref = a;
    a++;
    cout << "The value of a is " << aref;
    return 0;
}

A. A variable that stores the size of another variable B. A variable that stores the address of another variable C. A variable that stores a reference to another variable D. None of the above

A. ptr *type; B. type ptr; C. type *ptr; D. ptr type;

A. Address of x B. Garbage value C. Compilation error D. 5

A. *ptr B. ptr* C. &ptr D. ptr