If the line: friend class A: appears in class B, and the line: friend class B: appears in class C. then: A) Class A is a friend of class C. B) Class A can access private variable Class B. C) Class C can call class A's private member functions. D) Class B can access class A's private variables. The correct function name for overloading the addition (+) operator is: A) operator+ B) operator(+) C) operator: + D) operator_+ Suppose you have a programmer-defined data type Data and want to overload the