单项选择题 WhichofthefollowingistheMOSTimportanttroubleshootingstep？（）

单项选择题 Two file servers have run out of local disk space. The internal drives are at capacity and the company has traditionally only used local disks for storage. Which of the following is the MOST cost effective solution to add storage to both servers?（）

单项选择题 A server has a single failed hard drive in an array that is accessed through a hot plug backplane to ease replacement of failed drives. After replacing the drive several times， each of the replacement drives failed to power up and rebuild as the failed drive.  Which of the following is the MOST likely cause of the failures？（）