Q36

Consider the program given below, in a block-structured pseudo-language with lexical scoping and nesting of procedures permitted. Program main; Var ... Procedure A1; Var ... Call A2; End A1 Procedure A2; Var ... Procedure A21; Var ... Call A1; End A21 Call A21; End A2 Call A1; End main. Consider the calling chain$: \text{Main} \rightarrow \text{A1} \rightarrow \text{A2} \rightarrow \text{A21}\rightarrow \text{A1}$ The correct set of activation records along with their access links is given by: