Make a copy of the stack, leaving the stack unchanged. 9(Multiple choice) The statement stack.items [o]-stack.items [11: setting the top element equal to the second element) in a client program of the stack class a. would cause a syntax error at compile time. b. would cause a run-time error. c. would not be considered an error by the computer, but would violate the encapsulation of the stack data type. d. would be a perfectly legal and appropriate way to accomplish the intended task o.Multiple choice) The statements stack.Push(iteml +1) stack.Pop (iteml1): in the client program a. would cause a syntax error at compile time. b. would cause a run-time error