【单选题】
You are maintaining the SALES database of a company. You have never backed up the USERS tablespace that is currently offline. On Sunday， you issued the following commands：  <br /> CONFIGURE DEFAULT DEVICE TYPE TO sbt；  <br /> CONFIGURE BACKUP OPTIMIZATION ON；  <br /> CONFIGURE RETENTION POLICY TO REDUNDANCY 3；  <br /> From Monday to Saturday， you performed the following actions：  <br /> Day                         Action <br /> Monday                BACKUP DATABASE <br /> Tuesday&ensp
A、 The backup will not be performed at all.
B、 three times
C、 four times
D、 six times
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