A p5-570 8-way 32GB system has been proposed to a customer as a new test system with four LPARs.  The current applications are certified on AIX 5.2 but not yet on AIX 5.3.  The customer wants to understand the advantages and disadvantages of this solution versus a pair of 4-way p5-550s with 16GB each in testing their current applications. Which of the following points should the pSeries technical specialist highlight？（）

• A、The p5-570 would save rack space over a pair of p5-550 servers.
• B、The p5-570 allows for more CPU and memory resources to be dynamically allocated to any LPAR for performance testing.
• C、The p5-570 can only be upgraded to 64GB of RAM without replacing memory.
• D、The p5-570 supports advanced features such as Micro-Partitioning and Virtual I/O allowing more LPARs of the customer’s applications with fewer processors and fewer I/O adapters.