What will be output of this function?#include using

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What will be output of this function?

#include 
    using namespace std;
    int main()
    {
        register int p = 15;
        int *ptr = &p;
        cout << *ptr;
	    return 0;
    }

1. Compilation Error
2. Runtime Error
3. 15
4. 10
5. None of these

Correct Option: C

Using & on a register variable may be invalid, since the compiler may store the variable in a register, and finding the address of it is illegal.