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In the case of nested subroutines, the stack top is always _________

(a) The saved contents of the called sub routine

(b) The saved contents of the calling sub routine

(c) The return addresses of the called sub routine

(d) None of the mentioned

I got this question in an international level competition.

This interesting question is from Parameter Passing and Stack Frame in portion Machine Instructions and Programs of Computer Architecture

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Best answer
Right choice is (a) The saved contents of the called sub routine

Best explanation: None.

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