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？（）

单项选择题 An environment has a DC server and an Exchange server. The administrator needs to install a patch and restart both servers while minimizing downtime. Which of the following is the BEST way to restart the servers?（）