Which three facilities are used to control authorization in DB2?

Which three facilities are used to control authorization in DB2?

A. privileges, db2ssh, LBAC credentials
B. privileges, authority levels, certificates
C. db2ssh, trusted contexts, authority levels

D. privileges, authority levels, LBAC credentials

Reference: https://www.ibm.com/support/knowledgecenter/zh/SSEPGG_9.5.0/com.ibm.db2.luw.admin.sec.doc/doc/c0006307.html