A company wants to replace their Dell servers and implement x445 servers with a Storage Area Network （SAN）.  They will add an IBM TotalStorage DS4500 and EXP710s for their storage requirements.  The customer’s goal is to reduce the Total Cost of Ownership （TCO） of their current environment.  Which of the following factors provide the greatest advantage？（）

• A、The DS4500 with DS4000 Storage Manager provides efficient storage utilization.
• B、The DS4500 and x445 provide disaster recovery capability.
• C、The IBM TotalStorage DS4500 includes virtualization of the disk storage.
• D、Storage partitioning and Remote Volume Mirroring are standard features with the DS4500 product.