Examine these two statements: Which three are true about the MRKT tablespace?
A.
No more data files can be added to the tablespace.
B.
The relative file number of the tablespace is not stored in rowids for the table rows that
are stored in the MRKT tablespace.
C.
Users who were using the old default tablespace will have their default tablespaces
changed to the MRKT tablespace.
D.
The MRKT tablespace may be dropped if it has no contents.
E.
The MRKT tablespace is created as a small file tablespace, because the file size is less
than the minimum required for big file files.
A,B,C
ABC
You cannot drop a tablespace that has been designated as the default tablespace for the database. You must first reassign another tablespace as the default tablespace and then drop the old default tablespace.
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9004.htm