You execute the following command to change the status of the SALES tablespace：SQL> ALTER TABLESPACE sales OFFLINE； Which statements describe the effect of the command（）
A. The tablespace would require recovery to go back online.
B. A checkpoint is taken on all data files that are associated with the SALES tablespace.
C. The sessions that subsequently try to access the objects in the SALES tablespace receive an error
D. The new status of the SALES tablespace is recorded in the control file when the database instance isclosed
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