Which of the following function must use reference.

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