A nurse is caring for a client who is postoperative following total hip arthroplasty. Which of the following actions should the nurse take to prevent dislocation of the prosthesis?

Raise the head of the client's bed to a high-Fowler's position.

Keep an abduction pillow between the client's legs.

Elevate the client's affected leg on a pillow when in bed.

Position the client's knees slightly higher than the hips when up in a chair.