If the current state of the stack is [x, y, z] where x is the bottom of the stack and z is the top of the stack, what is the state of the stack and the value returned after a pop operation?
A. the state is [x, y]; z is returned
B. the state is [x, y, z]; z is returned
C. the state is [y, z]; x is returned
D. the state is [x, y, z]; x is returned
Answer: A
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