QUESTION 41 Polymorphism means many objects can be instantiated from a single class definition an object variable might reference objects of different classes different times. methods like toString can be defined in many different classes a class can extend multiple other classes QUESTION 42 In the following command sequence, numbered blocks are pushed and popped from a stack. Suppose that every time a block is popped, its numerical value is printed. What is the sequence of values that are printed? Assume you begin with an empty stack: push blocks, push block, pop pop push block2.push block, pop, push blocks 572 812 127 751 QUESTION 43 Starting with an empty stack, the sequence of operations push(1).push(2), popl).push(3). leaves the stack, from top to bottom, as: 1.2 3.2 2.1 QUESTION 38 While processing this expression (0000)) the highest number of elements on our stack at any one time is 4. True False QUESTION 39 Direct addressing is to indirect addressing as (indicate the best match): subclass is to superclass primitive variable is to reference variable memory address is to memory address contents constant is to variable QUESTION 40 While evaluating the following postfix expression: 6.43 10.22.. How many times is the push operation called? 9 11