Which of the following statements about the VCS services and resources provided by a clustered NAS system are correct? (Select 3 answers)

Which of the following statements about the VCS services and resources provided by a clustered NAS system are correct? (Select 3 answers)

A. A dependency relationship between service groups can be defined. B. A dependency relationship between resources can be defined, C. Each resource corresponds to one agent. D. Resource dependency relationships can be defined in a cyclic manner.