Question: Consider the following operations performed on a Stack S that is initially empty ( i . e . it has no elements, like an empty

Consider the following operations performed on a Stack S that is initially empty (i.e. it has no elements, like an empty stack of plates, or an empty browser history).
S.add(b)
S.add(c)
S.add(a)
S.remove()
S.add(c)
S.add(d)
This has produced a modified stack S.
Match each of the following operations on this modified stack S to their output. (That is, consider each of the following operations as the seventh operation after the six above; they are themselves not cumulative.)
S.remove()
S.size()

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