When the required reserve ratio is changed, O the money multiplier is changed but the amount of excess reserves in the banking system is unchanged. O the money multiplier is unchanged but the amount of excess reserves in the banking system is changed. O the size of the money multiplier and the amount of excess reserves change in the opposite direction from the required reserve ratio. O the size of the money multiplier and the amount of excess reserves change in the same direction as the required reserveratio.