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

A. it provides enhanced visibility across the entire application infrastructure 
B. it provides a set of management tools that enable automation of configuraion
C. it significantly increases the performance of Web-based applications with no code change
D. it dramatically reduces costs associated with diagnostics， configuration， and deployment on production servers