Which setting enables the baselines by default in Oracle Database 11g?

Which setting enables the baselines by default in Oracle Database 11g?

A.
Setting the STATISTICS_LEVEL parameter to TYPICAL

B.
Adding filters to the Automatic Database Diagnostic Monitor (ADDM)

C.
Enabling Automated Maintenance Task using Oracle Enterprise Manager

D.
Setting the OPTIMIZER_USE_PENDING_STATISTICS parameter to TRUE