A nurse is observing an assistive personnel (AP) who is using a mechanical lift with a hammock sling to transfer a client from the bed to a chair. For which of the following actions by the AP should the nurse intervene?

Locks the hydraulic valve before attaching the sling to the lift

Leaves the bed in the lowest position throughout the procedure

Raises the head of the bed to a sitting position just before the transfer

Places a removable cover over the sling