Explanation:
Box 1: No
User1 is in OU1, and Comp1 is in OU2. GPO2, which applies to OU2, contains the setting for Link4 in the User Configuration. Since User1 is not part of OU2, Link4 will not appear on the desktop.
Box 2: Yes
User2 is part of Group1, which is in OU1, and GPO1 is linked to OU1. GPO1's User Configuration will apply, which includes creating the Link2 shortcut.
Box 3: No
User3 is part of Group1, which is in OU2. GPO2 applies to OU2 and contains settings for Link3 and Link4, not Link2. Therefore, Link2 will not appear on the desktop for User3.