Question: The Stack class implements a stack using a singly - linked list. What member variables are needed in the Stack class? Group of answer choices

The Stack class implements a stack using a singly-linked list. What member variables are needed in the Stack class?
Group of answer choices
Only a pointer to the top node
Only a pointer to the bottom node
Pointers to both the top and bottom nodes
Pointers to the top, bottom, and middle nodes

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