Given That a Typedef for IntPtr Defines a Pointer to an Integer

Multiple Choice

Given that a typedef for IntPtr defines a pointer to an integer, what would be the correct declaration for a function that expects a reference to an integer pointer?

A) void f1 IntPtr& ptr) ;
B) void f1 IntPtr&* ptr) ;
C) void f1 IntPtr*& ptr) ;
D) All of the above