During implementation of a two-node cluster，it is determined that error notification for the shared Disk subsystem would be beneficial.  Which of the following is a pre-requisite for implementing automatic error notification？（）  

• A、 The cluster must not be running.
• B、 The cluster.es.server.utils lpp must be installed.
• C、 The error notification module must be enabled in RSCT.
• D、 The permissions on /tmp/hacmp.out need to be changed to 774.