Which two statements are true about standard database auditing?

Which two statements are true about standard database auditing? (Choose two.)

A.
DDL statements can be audited.

B.
Statements that refer to standalone procedure can be audited.

C.
Operations by the users logged on as SYSDBA cannot be audited.

D.
Only one audit record is ever created for a session per audited statement even though it is
executed more than once.