YouissuethefollowingRMANcommandtosetaretentionpolicyonadatabase：RMAN＞CONFIGURERETENTIONPOLICYTOREDUNDANCY2；Whatwillbetheoutcomeoftheabovecommand？（）

A.Aftertwodays，thebackupwillbemarkedobsolete. B.Aftertwodays，thebackupwillbedeletedfromthemedia. C.IftheRMANrepositoryhasrecordsoftwoormorerecentbackupsofafile，thentheolderbackupwillbedeletedfromthemedia. D.IftheRMANrepositoryhasrecordsoftwoormorerecentbackupsofafile，thentheolderbackupwillbemarkedobsolete.