83. 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 access private variables of class B.
(D) Class C can call class A's private member functions.
(E) Class B can access class A's private variables.
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