单项选择题 You are the network administrator for The network consists of a single DNS domain named. You replace a UNIX server with a Windows Server 2003 computer named TestKing1. TestKing1 is the DNS server and start authority (SOA) for testking.com. A UNIX server named TestKing2 is the mail server for testking.com. You receive reports that Internet users cannot send e-mail to the testking.com domain. The host addresses are shown in the following window. You need to ensure that Internet users can send e-mail to the testking.com domain. What should you do?（）

单项选择题 You are the network administrator for TestKing. You manage a Windows Server 2003 computer named TestKing4 that functions as an application server. TestKing4 will be used for development during the next 30 days. You need to back up all data on TestKing4 every day for the next 30 days. You need to automate the backups of TestKing4 to meet these business requirements. You want to achieve this goal by using the minimum amount of administrative effort. What should you do?（）

单项选择题 You are the network administrator for You manage a Windows Server 2003 computer named TestKing1. There are multiple scheduled tasks configure on TestKing1. One task is a scheduled backup job. You need to temporarily disable the backup job from running so that you can troubleshoot a problem. You must not interfere with any other scheduled tasks. You need to disable the scheduled backup job. You want to achieve this goal by using the minimum amount of administrative effort. What should you do?（）