What is the new value of P?#include using namespace

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What is the new value of P?

#include 
    using namespace std;
    void function(int &p)
    {
        p = 15;
    }
    int main()
    {
         int p = 12;
         function(p);
         cout << "New value of P is " << p;
         return 0;
    }

1. New value of P is 12
2. Compilation Error
3. New value of P is 15
4. Runtime Error
5. None of these

Correct Option: C

As we passed by reference, the value is changed and it is returned as 15.