How can a system manager trace all the activities of user BIG_CUBE?

A.
$ MCR SYSMAN AUDIT TRACE/USER= BIG_CUBE

B.
$ MCR AUTHORIZE MODIFY BIG_CUBE/FLAG=AUDIT

C.
$ SET SECURITY/CLASS=USER/OBJECT=* BIG_CUBE

D.
$ ACCOUNTING/USER=BIG_CUBE/IMAGE/ENABLE