What is output of the following program?

include
using namespace std;

class student
{
public:
    int marks;

    void disp()
    {
        cout << "Its base class";
    }
};

class topper : public student
{
public:
    void disp()
    {
        cout << "Its derived class";
    }
};

int main()
{
    student s;
    topper t;

    t.disp();
    s.disp();

    return 0;
}