The diagram shows a horizontal spring attached to a block. The block's equilibrium position is at C, and the block oscillates between points A and E with no friction. When the block is at C, which of the following statements is true? Select all apply. mass spring system the block's magnitude of the acceleration is maximum the block's speed is zero the magnitude of the net force on the block is maximum the block's speed is maximum the block's acceleration is zero the net force on the block is zero