Asystemhasacriticalneedfornetworkservicesonasmallnetworkwithalimitednumberofhosts.Systemoverheadisnotaconcern.Whichofthefollowingshouldthesystemadministratordotohelpensureconnectivityintheeventofagatewayfailure？（）
A.Usetheifconfigcommandtoenabledeadgatedetection
B.Usethenocommandtosetactivedeadgatewaydetection
C.Usetheroutecommandtosetactivedeadgatewaydetection
D.Addthelineactive_dgd=1tothe/etc/gated.confcommandandrefreshthegateddaemon
正确答案：参考C
