What is a prerequisite for using the application availability analysis tool in HACMP？（）  

• A、 Tivoli is required to generate reports from the data collected.
• B、 An application monitor must be associated with the application to monitor.
• C、 An "aaatd" daemon must be started and added in as a post event to "node_up_complete".
• D、 Resource group is present on all of the systems in the cluster that have the desired application.