You are the network administrator for TestKing.com. The network contains two Windows Server 2003 computers named TestKing7 and TestKing8. You install a new modem on TestKing7 to allow an application to dial out to your pager. You install the driver. When you test the modem, it does not dial out successfully. You install an identical hardware and driver configuration on TestKing2, and the modem dials out successfully. You need to find out if the modem card in TestKing7 is defective. What should you do on TestKing7?（）

• A、In Device Manager, right-click the modem, and then click Scan for hardware changes.
• B、In Modem Properties, click the Modem tab, and then set the maximum port speed to the same value as the value for the maximum port speed on TestKing8.
• C、In Modem Properties, click the Diagnostics tab, and then click the Query Modem button.
• D、In Device Manager, right-click Ports, and then click Scan for hardware changes.