You run Windows Defender on your computer and receive the following warning message：  "Windows Defender Definitions havent been updated."  You need to ensure that Windows Defender definition files are updated.  What should you do？（）

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• You have a computer that runs Windows 7. Your network contains a VPN server that runs Windows Server2008. You need to authenticate to the VPN server by using a smart card.  Which authentication settingshould you choose?（）

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