A.Multiple transactions can use the same undo segment.
B.A transaction is assigned an undo segment when it is started.
C.More than one transaction cannot share the same extent in the undo tablespace.
D.The transactions use system undo segment to store undo data if all the segments in the undo tablespaceare used.

A.The user is authenticated by the operating system.
B.The objects created by the user are placed in the USERS tablespace.
C.The user does not require quota on the TEMP tablespace to perform sort operations.
D.The user is forced to change the password at the first login to the database instance.
E.The objects created by the user in future are unlocked to be accessed by all the users in the database bydefault.