You are maintaining your database in Oracle10g. You perform a full user-managed backup every Sunday at 8：00 P.M. Your database is running in ARCHIVELOG mode. On Monday， at 9：00 A.M.， a tablespace is dropped. You decide to perform incomplete recovery to recover the dropped tablespace.  Which two clauses can you use with the RECOVER command？（）

• A、 UNTIL SEQUENCE
• B、 UNTIL SCN
• C、 UNTIL CHANGE
• D、 UNTIL CANCEL