What is the return value of f(p,p), if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.int f (int &x, int c) { c = c - 1; if (c == 0) return 1; x = x + 1; return f(x,c) * x;}

• A. 3024
• B. 6561
• C. 55440
• D. 161051