485 final process, is the priority decided by RD or ND

w a

Registered Users (C)
in the final stages whats considered the ND or RD, the reason i ask is coz during the mail frontlog problem a lot of people got RD and ND 2 months apart for ex:people who have RD in april 20 have ND in july 12 but some people whose RD is july 1 have ND july 10th. so just wanted to know.
 
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