Q. What is the output of this program?

#include 
    using namespace std;
    int add(int p, int q);
    int main()
    {
        int k = 7, L = 9;
        cout << add(k, L) << endl;
        return 0;
    }
    int add(int p, int q )
    {
        int sum = p + q;
        p = 10;
        return p + q;
    }

• (A) 7
• (B) 9
• (C) 10
• (D) 19