You can create a custom dimension for membership status using a User-level scope. A user-level scope can be used to represent hits data and the user’s component sessions in the form of a single value. Membership status like the rewards level can be represented by a single value like Gold level, Bronze level, Platinum level, etc. therefore User-level scope is the best scope to use in this situation.
This question is a part of the Google Analytics Individual Qualification. You can get all the answers with detailed explanation for this exam in our Google Analytics Individual Qualification Exam Answers page.