What happens when you attempt to compile and run the following code?

What happens when you attempt to compile and run the following code?
#include using namespace std; void fun(int);
int main()
{ int a=0; fun(a); return 0; }
void fun(int n)
{ if(n < 2) { fun(++n); cout << n; } } A. It prints: 21
B. It prints: 012
C. It prints: 0
D. None of these

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