单项选择题
Companycomisinstallingap5590withaHMCtomanageLPARs.Thecustomerisveryconcernedaboutsecurityandwantstorestrictnetworktrafficthatisnotnecessary.WhatisnecessaryforcommunicationbetweentheLPARsandtheHMC?()
A.AnadministrativeVLANwithport1808
B.Port657whichmustremainopentoTCP/IPandUDPtraffic
C.NetworkaddressesareprovidedbyDHCPservicesonthenetwork
D.DHCPontheHMCisrequiredtobeontocommunicatebetweenLPARandHMC