A company has acquired another company and is consolidating data centers. During the consolidation， half of the users of a business-critical application lost access. The users who maintained access experienced slow performance.  What is the first action the SAN/storage administrator should take to determine the source of the problem（）

• A、review SAN configuration， connectivity， and zoning
• B、review application parameters for contention or tuning problems
• C、use internal disk monitoring tools to determine the problem source
• D、check the disk parameters in the OS setup on the systems