The app builder should recommend utilizing the manage assignments button to assign a permission set group and additional individual permission sets to each user. This way, the app builder can assign the five consistent permission sets to all users in one permission set group, and then assign additional permission sets to higher-level staff as needed. Option B is incorrect because it will not account for the varying levels of support staff and their different permission sets. Option C is incorrect because the Data Import Wizard cannot be used to assign permission sets or permission set groups to users. Option D is incorrect because the Data Loader cannot be used to assign permission set groups to users.

The app builder should create a sharing rule that grants the users Read/Write access to the Application records. A sharing rule is a type of rule that can extend record access to groups of users based on certain criteria. In this case, the app builder can create a sharing rule that grants Read/Write access to the Application object to the recruiters based on their role, public group, or queue. This will allow them to edit the Application records related to any Internship record, regardless of the ownership. Option A, B, and C are not ways to configure the proper access.