Cardinal (Catholicism):

The cardinal deacons are the lowest-ranking cardinals. Cardinals elevated to the diaconal order are either officials of the Roman Curia or priests elevated after their 80th birthday. Bishops with diocesan responsibilities, however, are created cardinal priests.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What do bishops become that are without diocesan responsibilities?
unanswerable