what type of bugs are usually rejected and deferred by developer

Chance 1:
Differed means if one bug is raised in this cycle ,developer know about this bug but they don't fix it in this cycle they fix in next cycle or next version that time they kept this bug in differed stage.
if the bugs are raised by tester it is not valid like any validations .they reject the bugs


Chance 2:
Developer Rejected the bug when---
--Ths Bug is not Genuine.
--Result are not same

Developer Deferred the bug when---
--Priority Of bug may be low
--Lack of time for release
--The bug may not major effect on our application

Chance 3:
1. Tester will raised the bug with reproduction steps. Project Team will analysis whether the raised bug is valid or not. If the bug is not able to reproduced in the application . then Project team will "Reject" the bug.
2. If the bug is not so important for the present release, then Project Team will " Deferred" the Bug.