Which communications management practice includes specifying all of the communications systems and platforms that parties will use to share information?

The correct choice is grounded in the concept of establishing clear terms of collaboration among different parties involved in emergency management. Agreements specify how various stakeholders, such as agencies and organizations, will communicate during an incident. This includes detailing the specific communication systems, methods, and platforms that will be utilized for sharing information effectively and efficiently.

Agreements are crucial for ensuring that all parties are on the same page regarding operational communication strategy, reducing the potential for misunderstandings and enhancing coordination. By outlining specific systems and platforms, agreements help to streamline communication processes, which is essential during emergency situations where timely information exchange is critical.

Other practices like protocols involve general guidelines for conduct, standardization refers to uniformity in processes or systems, and briefings pertain to the specific dissemination of information during meetings. While these practices are valuable in their own contexts, they do not encapsulate the comprehensive specification of communication systems and platforms emphasized by agreements.