Explanation: False Distress alerts are a serious problem in radio communications, consuming valuable resources and potentially interfering with genuine emergencies. Preventing them is paramount. Options A, C, and D are all vital preventative actions. Proper watch officer instruction and training (A) and ensuring officers read manuals and are familiar with menus (D) directly address operator error, a leading cause of accidental transmissions. Securing the protective cover over the “Distress Hot Key” (C) physically prevents inadvertent activation of the Distress function. However, disabling the unit’s ability to perform DSC Relays & acknowledgments (B) does not prevent the unit itself from transmitting a false Distress alert. DSC Relays and acknowledgments are functions used by a station to retransmit or confirm receipt of *another station's* Distress call. Preventing these functions would hinder the efficient handling of actual Distress traffic rather than stopping one's own accidental transmission.