THERE IS ALWAYS A DATABASE-WIDE DEFAULT, WHICH (BY DEFAULT) IS SYSTEM

4. þ D. There is always a database-wide default, which (by default) is SYSTEM.

In many cases, it will have been set to TEMP.

ý A, B, C, and E. A is wrong because there is a default. B is wrong because

the default may not be SYSTEM (though it is by default). C is wrong because

while TEMP is a frequently used default, it may not be. E is wrong because all

user accounts must have a temporary tablespace.