单项选择题
YouaremaintainingtheSALESdatabaseofacompany.YouhaveneverbackeduptheUSERStablespacethatiscurrentlyofflinE.OnSunday，youissuedthefollowingcommands：
CONFIGUREDEFAULTDEVICETYPETOsbt；
CONFIGUREBACKUPOPTIMIZATIONON；
CONFIGURERETENTIONPOLICYTOREDUNDANCY3；
FromMondaytoSaturday，youperformedthefollowingactions：
DayAction
MondayBACKUPDATABASE
TuesdayBACKUPDATABASE
WednesdayBACKUPDATABASE
ThursdayBACKUPDATABASE
FridayBACKUPDATABASE
SaturdayBACKUPDATABASE
HowmanytimeswillthebackupoftheUSERStablespacebeperformed？（）
A.YouhaveneverbackeduptheUSERStablespacethatiscurrentlyofflinE.OnSunday，youissuedthefollowingcommands：