A nurse is reinforcing teaching with a client who is to have a plaster cast applied to his right arm. Which of the following information should the nurse include in the teaching?

The client should use a hair dryer on a warm setting to relieve itching inside the cast.

The client's extremity should be elevated after the cast is applied.

The client can shower with the cast after 24 hr.

The client should keep the cast covered until it is dry.