When caring for a client with a 3-cm stage 1 pressure ulcer on the coccyx, which of the following actions can the nurse institute independently（）
A. Using a povidone-iodine wash on the ulceration three times per day.
B. Using a normal saline solution and applying a protective dressing as necessary.
C. Applying an antibiotic cream to the area three times per day.
D. Massaging the area with an astringent every 2 hours.
