In the standard linked-list representation of a stack, where TOP points to the…

In the standard linked-list representation of a stack, where TOP points to the first node and links continue toward older stack elements, the null pointer of the last node in the list represents:

  1. A.

    Beginning of the stack

  2. B.

    Bottom of the stack

  3. C.

    Middle of the stack

  4. D.

    In between some value

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