Which of these is a benefit of ESM？（）

• A、 supports multiple MIBs
• B、 includes NetFlow， NBAR， and IP SLA software subsystems
• C、 includes NetFlow， syslog， and IP SLA software subsystems
• D、 includes a predefined framework for filtering and correlating messages
• E、 supports two logging processes so output can be sent in standard and ESM format