Q. What is the output of the following C++ code?

#include<iostream> 
using namespace std; 
  
int a = 55; 
void fun() 
{ 
    int a = 20; 
    { 
        int a = 10; 
        cout << ::a << endl;  
    } 
} 
  
int main() 
{ 
    fun(); 
    return 0; 
}

• (A) 10
• (B) 20
• (C) 55
• (D) None of the above