QWhat would be the output of the following program?

#include  
void main()
{
   extern int i;
   i =20;
   printf("sizeof(i)");
}

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• A 2 ✔ ✖
• B 4 ✔ ✖
• C would vary from compiler to coompiler ✔ ✖
• D undefined reference to `i' ✔ ✖

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