A server has lost communication to its drives located on a fiber channel SAN.An administrator notices that the indicator lights on both the HBA and the SAN switch are not lit.Which of the following are the MOST likely causes of the problem？（）

• A、Failed HBA
• B、Failed switch port
• C、Faulty fiber cable
• D、Faulty driver
• E、Failed hard drives
• F、Faulty configuration