You have successfully sold and installed your customer’s System x solution. Sometimes， the overall succeed of a sale depends on how well you have trained your customer to support their new hardware. Please consider the following tools. Which one would be the best for protectively determining a server outage， and contacting the system administrator about the outage？（）

• A、CDAT
• B、Configuration and Options Guide （COG）
• C、Physical Alarm Sounding in Data Center
• D、IBM Systems Director