Q. Output of following C++ program?#include<iostream>using namespace std;int main(){ int x = 10; int& ref = x; ref = 20; cout << "x = " << x << endl ; x = 30; cout << "ref = " << ref << endl; return 0;} (Solved)
1. x = 20; ref = 30
2. x = 20; ref = 20
3. x = 10; ref = 30
4. x = 30; ref = 30
- a. x = 20; ref = 30