
Explanation

Box 1: No
Share1$ is a hidden share (dollar sign appended) so the share will never be visible.
Box 2: Yes
User2 is in Group1 and Group2. Both groups have access to Share1$. Therefore, the contents of the shared folder will be visible.
Box 3: No
User1 is in Group1. Group1 does not have the necessary security permission to access Share2. You need both security permissions (NTFS permissions) AND share permissions to view the contents of a shared folder.
User1 has the necessary share permissions (Everyone: Read), but not the security permission.