View the Exhibits. You performed operations on the DEPT4 table as shown in the Exhibit. When you perform the FlashbackVersions Query， you find that the first two updates are not listed. What could be the reason？（） 

AThe row movement is not enabled on the table.

BThe first two updates were not explicitly committed.

CThe Flashback Versions Query lists only the most recent update.

DThe Flashback Versions Query stops producing rows after it encounters a time in the past when the  table structure was changed.