Correct Answer: CTo retain data across Microsoft 365, you need to account for different data locations and types. Microsoft Teams requires separate policies for Teams channel chats and Teams private channel messages because you cannot combine these in one retention policy. Similarly, data retention for Microsoft OneDrive, Microsoft SharePoint, and Microsoft Exchange Online can be managed together in a single retention policy. Therefore, the minimum number of retention policies required is three: one for Teams channel chats, one for Teams private channel messages, and one for Exchange, OneDrive, and SharePoint.