Which two methods would you use to do this?

You need to determine how often a particular database feature is used in the database.
Which two methods would you use to do this? (Choose two)

A.
User alert log file

B.
Use Database Option Advisor

C.
Use the DBMS_STATS package

D.
Use the DBMS_RESOURCE_MANAGER package

E.
Run a query on DBA_FEATURE_USAGE_STATISTICS

F.
Open the Database Usage Statistics page of Enterprise Manager (EM)