One of your best customers has limited funding and is interested in the ability to increase a system’s computing power as needed.  Which of the following System x server attributes should the Sales Specialist promote？（）

• A、Ability to hot-plug additional processors on demand
• B、Low cost of System x servers makes scaling out an option
• C、"Pay as you Grow" scalability of the IBM System x3950 server
• D、Integration of System x servers with the existing servers using an interconnect