AfterupdatingserverB’snetworkconfigurations，anadministratornoticesthatserverA，whichresidesinadifferentsubnet，isunabletocommunicatewithserverBviasshortelnet.Asping’stotheserverfail，theadministratorlogsontoserverBviaaconsoleandfindsanavailableinterfaceen0inthe‘up’state.Fromtheconsoleconnection，en0cancommunicatewithotherserversinthesamesubnet.Whatisthemostlikelycauseoftheproblem？（）

A.en0hasnoassociatedipaddress.

B.serverBismissingitsdefaultroute.

C.serverBandserverAcannotconnectduetoafirewall.

D.en0hasbeensetuptoblocktrafficfromserversthatareindifferentsubnets.