Why would you use WebLogic Diagnostics Framework （WLDF） instead of Oracle Enterprise Manager （OEM） （）
A、 WLDF has better performance than OEM
B、 my organization already has a solution for unified management and monitoring； we need to supplement that with some specific WLS-related capabilities
C、 OEM is not certified with latest version of WLS
D、 OEM is really focused on the database tier， is not meant to address JEE management and monitoring
