Answer: C - The nurse is incorrect when she instructs the client to sit upright on the bed. Ideally, the client is placed in a low Fowler's position to keep the abdomen flat. This position prevents skin folding, which can cause the appliance to slip. A low Fowler's position allows the client to observe the procedure and encourages interest in performing the procedure themself. The nurse should maintain asepsis to avoid the transmission of harmful microorganisms. Timing is important; the appliance is changed during a period of low fluid intake (i.e., early morning).