Which three statements are true about automated maintenance tasks? (Choose three.) 

Answer options:

A. They run at predefined time intervals that are intended to occur during a period of low system load.
B. An Oracle Scheduler job is created for each maintenance task that is scheduled to run in a maintenance window.
C. A maintenance window is automatically extended until all the maintenance tasks defined are completed.
D. A repository is maintained in the SYSTEM tablespace to store the history of execution of all tasks.
E. Predefined maintenance tasks consist of automatic optimizer statistics collection, running Automatic Segment Advisor, and running Automatic SQL Tuning

ABE

References - https://docs.oracle.com/cd/E11882_01/server.112/e25494/tasks.htm#ADMIN12331