You want to be notified when the space usage of an existing critical tablespace has reached 75% of the allocated space. Which option would you use to achieve this?()
A. run a procedure to check the tablespace space usage
B. define the warning threshold for the tablespace at 75% in Database Control
C. create a trigger to be executed when tablespace space usage reaches 75%
D. submit a job by using DBMS_JOB package to check the free space in the tablespace at regular intervals
E. define the warning threshold to be 75% for the tablespace by ALTER TABLESPAC. ADD THRESHOLD command