Which of the Following Statements About the High Availability Daemon

Which of the following statements about the high availability daemon (HAD) function of an N8500 clustered NAS system are correct? (Select three.)

A) Each host in the N8500 cluster runs a HAD process.
B) The hastart command can be executed to enable the had and hashadow services to automatically start.
C) HAD is used to monitor and manage the statuses of all services on the clustered NAS system.
D) The clustered system uses hashadow to monitor the HAD process. If HAD becomes abnormal, hashadow can restart HAD.