A customer is interested in purchasing a new IBM System Storage DS8000 solution to consolidateolder ESS and F20 storage systems. What should be done first, prior to final proposaldevelopment?（）

• A、perform a Disk Magic study 
• B、review eConfig with a technical specialist 
• C、confirm that the customer has enough ports available in the SAN infrastructure 
• D、submit configuration to IBM System Storage Interoperability Center for validation