单项选择题 Wheninstallingaserverinarack，whichofthefollowinglocationsdescribeswhereintheracka servershouldbeinstalled？（）

单项选择题 Which of the following backup methods should be used nightly to ensure backups capture all necessary data in the LEAST amount of time?（）

单项选择题 An administrator needs to update the anti-virus， security patches， BIOS， and the web server software on a production system.  Which of the following is the BEST method to accomplish this？（）