Which two statements about the SQL Management Base (SMB) are true?（）

A. It contains only SQL profiles generated by SQL Tuning Advisor.

B. It stores plans generated by the optimizer using a stored outline.

C. It is part of the data dictionary and stored in the SYSAUX tablespace.

D. It is part of the data dictionary and stored in the SYSTEM tablespace.

E. It contains the statement log, the plan history, plan baselines, and SQL profiles.