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What is the invariant of the Stack Class ( Linked - List Version ) ? a . The number of items in the stack is

What is the invariant of the Stack Class (Linked-List Version)?
a. The number of items in the stack is stored in the member variable used.
b. The items in the stack are stored in a linked list, with the top of the stack stored at the head node, down to the bottom of the stack at the tail node.
c. The items in the stack are stored in a partially filled array called data, with the bottom of the stack at data[0], the next entry at data[1], and so on to the top of the stack at data[used-1].
d. The member variable top_ptr is the head pointer of the linked list of items.

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