Program main; Var ... Procedure A1; Var ... Call A2; End A1 Procedure A2; Var ... Procedure A21; Var ... Call A1; End A21 Call A21; End A21 Call A1; End main.Consider the calling chain : Main->A1->A2->A21->A1 The correct set of activation records along with their access links is given by :
(A)
(B)
(C)
(D)
Answer
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