Which of the following constructor is used in the program given below?

#include<iostream.h> 
class AptitudeCrack
{
    int x, y; 
    public:
    AptitudeCrack(int xx = 10, int yy = 20 )
    {
        x = xx; 
        y = yy;
    }
    void Display()
    {
        cout<< x << ' ' << y << endl;
    } 
    ~AptitudeCrack()
    { } 
};
int main()
{
    AptitudeCrack objAptitude; 
    objAptitude.Display(); 
    return 0;
}