A customer has an EMC Symmetrix DMX-4 installed. The disk subsystem is coming off lease. The customer is considering an IBM System Storage DS8800.  What is a key advantage of the  DS8800（）

• A、The DS8800 has a higher disk RPM than the Symmetrix DMX-4
• B、The DS8800 has higher capacity with more efficient footprint than the Symmetrix DMX-4
• C、The DS8800 supports FlashCopy for internal array replication
• D、The DS8800 supports external virtualization