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

#include <iostream>  
using namespace std;
int f(int &x, int c) 
{
   c  = c - 1;
   if (c == 0) return 1;
   x = x + 1;
   return f(x, c) * x;
} 
int main(int argc, char const *argv[])
{
	int a = 4;
	cout<<f(a,a);
	return 0;
}

What is a pointer in C++?

A. A variable that stores the size of another variable

B. A variable that stores the address of another variable

C. A variable that stores a reference to another variable

D. None of the above

How do you declare a pointer variable in C++?

A. ptr *type;

B. type ptr;

C. type *ptr;

D. ptr type;

What is the output of the following code: int x = 5; int *ptr = &x; cout << *ptr; in C++?

A. Address of x

B. Garbage value

C. Compilation error

D. 5

What is the correct syntax to dereference a pointer in C++?

A. *ptr

B. ptr*

C. &ptr

D. ptr