单项选择题 Which of the following describes how to calculate the amount of storage in a RAID 5 array?（）

单项选择题 A server was recently updated with the latest antivirus definitions. Immediately after the update,the server begins to report file not found? errors for a mission critical application. Which of the following is the MOST likely reason for this?（）

单项选择题 An administrator receives a call from a user who is unable to receive email. After troubleshooting the administrator is able to resolve the issue and verify that user is able to access email again.  Which of the following is the NEXT step that the administrator should take？（）