
Explanation:
Box 1: No
Role-assignable groups are designed to help prevent potential breaches by having the following restrictions:
Group nesting isn't supported. A group can't be added as a member of a role-assignable group.
Box 2: No
M365 groups cant be added to membership of another group.
Box 3: Yes
The statement is not complete but if it states to assign the role to Group3 directly it is possible.
https://learn.microsoft.com/en-us/azure/active-directory/roles/groups-concept#restrictions-for-role- assignable-groups