What is the output of this program?#include <iostream>

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What is the output of this program?

#include <iostream>
    using namespace std;
    struct N 
    {
        virtual void fun()  
        { 
            cout << "Class N" << endl; 
        }
    };
    struct M : N 
    {
        virtual void fun() 
        { 
            cout << "Class M" << endl;
        }
    };
    struct O : N 
    {
        virtual void fun() 
        {
            cout << "Class O" << endl; 
        }
    };
    void fun(N* argumnet) 
    {
        M* ptr1 = dynamic_cast<M*>(argumnet);
        O* ptr2 = dynamic_cast<O*>(argumnet);
        if (ptr1)
            ptr1 -> fun();
        else if (ptr2)
            ptr2 -> fun();
        else
            argumnet -> fun();  
    };
    int main() 
    {
        N Object1;
        O Object2;
        N* ptr1 = &Object2;
        N* ptr3 = &Object1;
        fun(ptr1);
        fun(ptr3);
    }

1. Class N
  Class O
2. Class M
  Class N
3. Class M
  Class N
4. Class M
  Class O
5. Class O
  Class N

Correct Option: E

In this program, We applied the dynamic casting to structure and produced the output.