What must be done before defining a pre-event command for a predefined cluster event?

A.
Populate the PRE_EVENT_CMD variable in the predefined event script

B.
Define a custom event command using the SMIT “Add a Custom Event” dialog

C.
Populate the cluster events directory on each node with the script/executable

D.
Specify the absolute path to the command on the “Change/Show Pre-defined PowerHA Event”
SMIT dialog