14. Your undo tablespace consists of one datafile on one disk, and transactions
are failing for lack of undo space. The disk is full. You have enabled retention
guarantee. Any of the following options could solve the problem, but which
would cause downtime for your users? (Choose the best answer.)
A. Create another, larger, undo tablespace and use alter system set
undo_tablespace= . . . to switch to it.
B. Move the datafile to a disk with more space, and use alter database
resize datafile . . . to make it bigger.
C. Reduce the undo_retention setting with alter system set
undo_retention= . . . .
D. Disable retention guarantee with alter tablespace . . .
retention guarantee.
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