Question: Suppose an initially empty stack S has performed a total of 30 push operations, 12 top (or peek) operations, and 10 pop operations, 4 of

Suppose an initially empty stack S has performed a total of 30 push operations, 12 top (or peek) operations, and 10 pop operations, 4 of which returned null to indicate an empty stack. What is the current size of S? A) 22 B) 24 C) 21 D) 4

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