Final answer:
The Command Post is typically responsible for presenting information during an Operational Period Briefing, although for specific events like geomagnetic storms, the National Weather Service may be involved.
Step-by-step explanation:
During an Operational Period Briefing, the entity responsible for presenting information typically depends on the type and scope of the event but is often the Command Post or the Incident Command, which represents the primary operation's decision-making body. For instance, if the briefing involves preparedness for events like geomagnetic storms, the National Weather Service (NWS) or specifically the NOAA Space Weather Prediction Center might present relevant information. County Emergency Management offices would generally focus on local operational issues, while Divisions A, B, and C might report on operational issues in their respective areas.