A customer wants to run VMWare ESX on an x445 with a large number of virtual machines running Windows 2003 Server as a Disaster Recovery （DR） Site for the production environment.  Which of the following questions would most impact the memory configuration？（）

• A、What version of VMWare ESX Server is being considered？
• B、Do the systems currently use Double Data Rate （DDR） memory？
• C、What is the total number of processors installed in the production systems？
• D、What is the total amount of memory currently being used across all the production systems？