You need to grant three users temporary access to a SharePoint document library and ensure the groups are automatically deleted after 180 days. Which two group types should you create?

Microsoft 365 groups are the correct choice because they support expiration policies, allowing automatic deletion after a set period (like 180 days). Both "Assigned membership" and "Dynamic User membership" are valid ways to populate a Microsoft 365 group. Assigned membership means you manually add users, while Dynamic User membership automatically adds users based on defined rules. Security groups, on the other hand, do not inherently support expiration policies, so they cannot fulfill the requirement of automatic deletion after 180 days. Dynamic Device membership is irrelevant here as the requirement is for user access, not device access.