A client's catheter bag was left on the client's bed for a prolonged period of time, and the client develops a urinary tract infection (UTI). In evaluating the cause of the infection, which should the nurse identify as the infection reservoir?

A. Client's bladder: The bladder is typically sterile. Infection is most likely introduced from external sources such as the catheter or tubing. B. Catheter tubing: The catheter and its tubing can harbor bacteria, which increases the risk of a urinary tract infection. C. The client's bed: Although the bed should be kept clean, it is unlikely to be the direct source of infection. D. Urinary meatus: The meatus is usually sterile, and infection is more likely to arise from the catheter or tubing.