Explanation:

According to the Microsoft SC-300 Study Guide and Microsoft Learn module: "Manage Microsoft 365 group lifecycles" , group expiration policies in Microsoft Entra ID apply only to Microsoft 365 groups (formerly Office 365 groups).
Group expiration is part of lifecycle management for Microsoft 365 services and helps ensure that unused groups are automatically deleted after a defined period unless renewed by the owner.
From the table:
* Group1 (Security) # Cannot be set to expire.
* Group2 (Microsoft 365) # Can be set to expire.
* Group3 (Mail-enabled security) # Cannot be set to expire.
* Group4 (Distribution) # Cannot be set to expire.
Therefore, Group2 only can have an expiration policy applied.
Regarding group lifetime, the Exam Ref SC-300 and Microsoft documentation confirm that the minimum (shortest) group lifetime that can be configured for Microsoft 365 group expiration policies is 30 days.
Microsoft Learn states:
"The group lifetime can be set to 30, 60, 90, 180, or 365 days. The minimum allowed is 30 days." This ensures group owners have sufficient time to renew or manage expiring groups before automatic deletion.