Which two statements are true with respect to the maintenance window? (Choose two.)

Which two statements are true with respect to the maintenance window? (Choose two.)

A.
A DBA can enable or disable an individual task in all maintenance windows.

B.
A DBA cannot change the duration of the maintenance window after it is created.

C.
In case of a long maintenance window, all Automated Maintenance Tasks are restarted every four hours.

D.
A DBA can control the percentage of the resource allocated to the Automated Maintenance Tasks in each window.