How should a crew be notified of a signal change during operations?

Answer: B — Via radio communication

Notifying a crew of a signal change during operations is most effectively done through radio communication. This method allows for immediate and clear communication between crew members, ensuring that everyone is aware of the change in signals as quickly as possible. Radio communication is essential in maintaining safety and coordination, particularly in an environment where quick responses are crucial. While visual signal indicators do play a role in communication, they may not always be visible to all crew members depending on their location and the operational context. Coded messages and written notices can introduce delays in communication, which could be dangerous in a rapidly changing operational environment. Therefore, radio communication is the preferred method for promptly and efficiently conveying signal changes, ensuring that all crew members are adequately informed and can respond accordingly.