A. CREATE TABLESPACE DATA1 DATAFILE ’+grp1/abc（datafile）’；
B. CREATE TABLESPACE DATA1 DATAFILE ’+grp1’；
C. CREATE TABLESPACE DATA1 DATAFILE ’+data1（tempfile）’；
D. CREATE TABLESPACE DATA1 DATAFILE ’+grp1.256.34359’；

A. The database will not start.
B. The database will start but will not retain the undo data in the undo segment.
C. The database will start， and the undo segment will contain the undo data for at least one hour.
D. The database will start， and the undo segment will retain the undo data for at least 15 minutes.