单项选择题 An administrator is upgrading memory on the server. Once the server in turned back on， the administrator notices that the memory has not changed. The system board website says the board should accept the new amount of memory.  Which of the following should the administrator do FIRST？（）

单项选择题 Whichofthefollowingdeviceswouldbeinstalledifanadministratorwantstocontrolagroupof serversfromaremotelocation？（）

单项选择题 Weekly backups of the system are done on Sundays， and daily backups are done the rest of the week.  Which of following backup methods were used if the system crashes on Friday and only requires two backup sets to recover the system？（）