The customer has implemented an SNMPP based network monitoring tool and wishes to monitor chang3es in the cluster. The general status of the cluster is gathered via SNMP but the poling time to retrieve the status is too slow for immediate reaction to serious issues. There is a technical reason why the polling time cannot be changed.  How can HACMP report changes in its status on a more timely basis？（）  

• A、 Create a pre/post event script to report errors more rapidly.
• B、 Edit SNMP configuration file to send traps for cluster state changes.
• C、 Change the option in "SRC" to enable trap mode for the "clinfo" process.
• D、 Use the "monitor" pre-event facility in HACMP to send information to the monitoring device.