You have an Exchange Server 2010 organization. You plan to deploy a database availability group （DAG）. You need to recommend disk configurations for the servers in the organization. The solution must minimize costs. What should you recommend？（）
A、7200 RPM SATA hard disks in a Direct Attach Storage （DAS）
B、7200 RPM SATA hard disks in a Network Attached Storage （NAS）
C、15000 RPM SAS hard disks in a Network Attached Storage （NAS）
D、15000 RPM SAS hard disks in a Fibre Channel （FC） Storage Area Network （SAN）
