Which of the following statement is correct about the program given below?

#include<iostream.h> 
class CuriousTabBase
{
    int x, y; 
    public:
    CuriousTabBase(int xx = 10, int yy = 10)
    {
        x = xx;
        y = yy;
    }
    void Show()
    {
        cout<< x * y << endl;
    }
};
class CuriousTabDerived
{
    private:
        CuriousTabBase objBase; 
    public:
    CuriousTabDerived(int xx, int yy) : objBase(xx, yy)
    {
        objBase.Show();
    }
};
int main()
{
    CuriousTabDerived objDev(10, 20);
    return 0; 
}