1. Which of the following statement is correct about the program given below? #include<iostream.h> int x, y; class BixTest { public: BixTest(int xx = 0, int yy = 0) { x = xx; y = yy; Display(); } void Display() { cout<< x << " " << y << " "; } }; int main() { BixTest objBT(10, 20); int &rx = x; int &ry = y; ry = x; rx = y; cout<< rx--; return 0; }