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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 LinkedList 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 the next entry at data and so on to the top of the stack at dataused
d The member variable topptr is the head pointer of the linked list of items.
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