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 variables of class B.
c. Class C can call class A’s private member functions.
d. Class B can access class A’s private variables.
b. Class A can access private variables of class B.
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