Which code, inserted at line 19, generates the output “23”?

Which code, inserted at line 19, generates the output “23”?
#include #include using namespace std;
class A {
int x; protected: int y; public: int z;
A() { x=1; y=2; z=3; }
};
class B : public A { string z; public:
int y; void set() { y = 4; z = “John”; } void Print() { //insert code here
}
}; int main () {
B b;
b.set();
b.Print(); return 0; }
A. cout << y << z;
B. cout << y << A::z;
C. cout << A::y << A::z;
D. cout << B::y << B::z;

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