Final answer:
System Administrators, End Users, and Resource List Managers can all tweak an existing resource list, depending on their role.
Step-by-step explanation:
The correct answer is C) Both A and B.
System Administrators, End Users, and Resource List Managers can all tweak an existing resource list, but the level of access and control may vary for each role.
System Administrators have the highest level of access and control over resources and can make changes or modifications to the resource list. End Users, on the other hand, may have limited access to tweak the resource list, depending on the permissions granted by the System Administrator. Resource List Managers, who are responsible for managing and curating the list, can also tweak the resource list within the scope of their role.