Discussion
Access to a variable of an enclosing procedure at run time requires
Answer: A
Correct answer: following access links or consulting a display
A nested procedure’s variables live in the activation record of whichever invocation of the enclosing procedure is current, and that is found at run time. An access link in each frame points to the enclosing frame, so the chain is followed as far as the nesting depth requires; a display holds those pointers in an array so the frame is reached in one step.
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