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?