单项选择题

Inwhatsituationwouldthecommandiphelper－addressberequired？（Choosethebestanswer.）（）

A.OnlywhenthereisaduplicateIPaddresscausedbyacombinationofstaticanddynamicIPaddressallocations
B.Oneachrouterthatexistsbetweentheclientandtheserver
C.Onlywhenarouterseparatestheclientfromtheserver
D.OnlyiftheDHCPseverissuesaDHCPNAKtotheinitialrequest
E.Onlywhentheclientisonthesamesubnetastheserver
F.OnlywhentheDHCPpoolisoutofIPaddresses

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