Which two statements are true about server-generated alerts? (Choose two.)
A.
They are always logged in the alert log.
B.
They are written to a trace file if the TRACE_ENABLED initialization parameter is set to TRUE.
C.
They are generated only when the STATISTICS_LEVEL initialization parameter is set to ALL.
D.
They can be generated for user-defined metric thresholds.
E.
They appear in the DBA_ALERT_HISTORY view whenever corrective action is taken for an alert.