Consider the following operations performed on a Stack with array implementation of size 10. How many elements stay in the stack after all these operations? StackArray stack stack push(9); stack.push(19); stack.push(29); stack.pop(); stack.push(39); stack.push(49); stack.pop(); stack.push(59); stack.push(69); Your answer: O 7 O 4 O 10 = new StackArray(10);