What scope would be set for a custom dimension that reports membership status for a customer rewards program?

Setting the scope for a custom dimension that reports membership status for a customer rewards program to "User" is appropriate because membership status is a characteristic that is generally associated with the individual user rather than a specific interaction or event.

In this context, the membership status indicates whether a user is a member of the rewards program, and this status is likely to remain constant over time for that user until it changes—unlike session scope, which would be relevant only to the interactions within a particular session, or event scope, which pertains to individual actions taken by the user.

Choosing user scope for this dimension means that Google Analytics will associate the membership status with that user across multiple sessions and events, providing a comprehensive view of user behavior in relation to their membership status throughout their interactions with the site or app. This is crucial for analyzing how membership influences user behavior over time, which is a key aspect of understanding the effectiveness of a rewards program.