Stack X is an empty stack. Please answer the questions below after tracking the activities below step by step: X.push(4): X.push(3); X.push((7): Yi = X.pop(); Y2 = X.pop(); X.push(2), X.push(3) Y3 -X.peeko: a YI b. Y2 c. Y3 d X= (after all the above statements are executed, starting from the bottom of the stack) Queue MyQueue is an empty queue. Please answer the questions below after tracking the activities below step by step MyQueue.enqueue(4): My Queuc.enqueue(3): My Queue, enqueue (7): YI = MyQueue dequeue: My Queue enqueue (2) Y2 = My Queue dequeue 0. My.Queue enqueue (3); Y3 = MyQueue firstElO: CIS 334 Assignment - Stacks and Queues a Y1 = b. Y2 - cY3 = d. X = (after all the above statements are executed, start from the front of the queue)