The only groups that can be assigned Azure Active Directory Premium P2 licenses are security groups and Microsoft 365 groups that are security-enabled. From the given list: Group1 is a security group (security-enabled) and Group3 is a Microsoft 365 group (security-enabled). Therefore, licenses can be assigned to Group1 and Group3 only. Group2 is a mail-enabled security group, which is not eligible for license assignment, and Group4 is a Microsoft 365 group but it is security-disabled.