Predict the output

Predict the output of the following code snippet.

#include<iostream>
using namespace std;
class A
 { 
 public: 
 virtual void function1() {cout<<"A :: function1()\n";}; 
 virtual void function2() {cout<<"B :: function2()\n";}; 
 virtual ~A(){};
}; 
 
class B: public A 
{ 
public: 
 ~B(){};
 virtual void function1_virtual() 
 { 
 cout<<"B :: function1()\n";
 
 }; 
	
}; 

int main() 
{ 
	B *b = new B; 
	A *a = b; 
	a->function1();
 a->function2();
 delete (a);
 
 return (0);
}

Options

1. A :: function1()
2. B :: function2()
3. A :: function1(),B :: function2()
4. B :: function2(),A :: function1()