为自己加油

Which two are true about diagnosing Oracle Database failure situations

Using Data Recovery Advisor? (Choose two.)

A.
Using the Data Recovery Advisor LIST FAILURE command always requires that
The database for Which failures are to be listed is in MOUNT state.
B.
A failure can be closed only when it has been repaired.
C.
Data Recovery Advisor can be used if a database is closed.
D.
The Data Recovery Advisor CHANGE FAILURE command can be used only to
Change failure priorities.
E.Data Recovery Advisor can proactively check for failures.