In the array implementation of the stack, top is decremented in the pop function because:
A. it is an index to the current top of the stack, and that index decreases by one on a pop
B. it stores the value of the current top of the stack, and a value lower in the stack is always less
C. top records the number of elements in the stack, and the number of elements decreases by one on a pop
D. otherwise, there would be no way to access the array position that needs popped
A
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