The nurse is caring for a client with a fractured hip. The client is combative and confused, and he's trying to get out of bed. The nurse should （）.

A．leave the client and get help.

B．obtain a physician's order to restrain the client.

C．read the facility's policy on restraints.

D．order soft restraints from the storeroom.

______即信息系统的功能模型描述了系统的总体构成。