Which of the following is not an operation on a stack? Selected pop Question 3 Which of the following is not a valid postfix expression? Selected 4 + 5 Question 4 What is the result of evaluating the following postfix expression: 4 8 + 2 * Selected 24 Question 5 What exception is thrown if the pop method is called on an empty stack, implemented using the ArrayStack class? Selected NoSuchElementException Question 6 Which of the following methods inserts an element into a stack data structure? Selected dequeue Question 7 A stack is the ideal collection to use when . Selected finding the largest number in an array Question 8 A(n) is an object that gathers and organizes other objects. Selected collection Question 9 In Java, type compatibility is enforced by . Selected an Enforcer object Question 10 Java uses to allow us to define a class and not specify the type of the objects that the class employs until the class is instantiated. Selected inheritance Question 11 Which of the following stack operations is not likely to cause an exception to be thrown? Selected adding an item to the stack when the stack is full Question 12 A Stack interface is defined and has an isEmpty() abstract method. What should this method return? Selected the item that is at the top of the stack Question 13 Which of the following situations could be implemented using a Stack? Selected [None Given] Question 14 In an array implementation of a stack, we can include code that will automatically allocate more memory if every element of the array is occupied. Which stack operation should invoke this code? Selected peek Question 15 The peek operation of a stack is Selected none of the above