There is a power outage and all servers are shut down properly by the uninterruptible power supply (UPS) software. When one of the servers starts up it displays a logical drive failed error. This server has two processors, 16GB of memory, and a RAID 5 array with 10 drives. Which of the following is the MOST likely cause?（）

• A、A failed RAID controller
• B、Two failed processors
• C、Two failed sticks of memory
• D、Two failed drives