单项选择题 WhichofthefollowingistheBESTwaytomakesurethenetworkprinterisautomaticallyinstalled whentheuserlogson？（）

单项选择题 An administrator has just installed a web server for the companys Internet site. After bringing the system online， customers notify the administrator that they cannot connect to the server. The administrator tests the web server from a workstation and can access the website. The customers continue to report issues.  Which of the following is the MOST likely reason for this？（）

单项选择题 Which of the following types of DNS records enables support for email?（）