Which channel is used as the admin channel in the VHF backup procedures?

The correct answer is B, XSD CMD 4, as it is designated specifically for administrative communications within the VHF backup procedures. In emergency service operations, having a clear and dedicated channel for administrative purposes is crucial for ensuring that essential communications do not interfere with operational channels used during incidents.

XSD CMD 4 provides a structured environment for command staff and administrative personnel to communicate effectively, allowing for coordination of resources, personnel updates, and overall situational awareness without congesting tactical channels that are needed for ongoing emergency responses. This separation helps maintain clarity and efficiency in communication during critical situations.

While the other options may be used for different operational or tactical communications, they are not designated specifically as the administrative channel, which is essential for managing the broader aspects of incident command and support functions.