多项选择题 A companys legal and regulatory departments have drafted a new policy in which emails must be retained for no longer than three years.  Which of the following locations should an administrator configure when complying with the new policy？（）

单项选择题 An administrator is looking to apply a new service pack for an OS on several systems that run business critical applications for a large international finance corporation.  Which of the following should the administrator do FIRST？（）

单项选择题 Which of the following ensures that air is passed through a server chassis correctly?（）