A customer has a combination of fifteen Windows file servers with direct attached storage and three Power Systems with AIX database servers SAN attached to a DS4700.  They would like to upgrade and plan for 40 TB capacity.  The customer needs to move to a more scalable storage system to include all servers.Which of the following would be most appropriate to ask first?（）

• A、What are the plans for Disaster Recovery? 
• B、What are the plans for data migration? 
• C、Would iSCSI meet your needs? 
• D、How much space is available in the current storage systems?