What will be the output of the following C++ code?

#include <iostream>  
using namespace std;
class A{
public:
	int a;
	A(int a=0){
		this->a = a;
	}
};
int main(int argc, char const *argv[])
{
	A a1, a2(10);
	cout<<a2.a;
	return 0;
}

What is a constructor in C++?

A. A function used to create objects

B. A special member function that initializes objects

C. A function used to access class members

D. None of the above

Which access specifier allows constructors to be called from anywhere in the program in C++?

A. friend

B. protected

C. public

D. private

What happens if a class does not explicitly declare any constructors in C++?

A. A compilation error occurs

B. The class cannot be instantiated

C. The class is initialized with default values

D. A default constructor is provided by the compiler

What is the purpose of a destructor in C++?

A. A special member function that destroys objects

B. A function used to create objects

C. A function used to initialize objects

D. A function used to access class members