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. In evaluating the cause of the infection, what should the nurse identify as the infection reservoir?

A. The urinary meatus is the external opening of the urethra and is not the source of the infection in this case. B. The client's bed is not a direct reservoir for the infection, although poor hygiene practices can contribute to contamination. C. Catheter tubing can harbor bacteria if not properly managed, leading to urinary tract infections. Prolonged periods without proper drainage can allow bacteria to multiply. D. The client's bladder can become infected due to bacteria introduced via the catheter tubing, but it is not the initial reservoir.