单项选择题
WhenconsideringthedesignoftheIPv6addressplanfortheEnterpriseCampusnetwork，whichofthefollowingshouldserveasguidance？（）
A.AlltheIPv6subnetsshouldusea/32prefix
B.Setaside/31prefixestosupportpoint-to-pointlinksandloopbackinterfaces
C.TheIPv6addressplanshouldbedesignedtosupporttheserviceblockmodeldesignorintegrationwithIPv4
D.Designate16subnetbitstobesplitupintelligently，eitherbyOSPFarea.VLANnumbering，orIPv4mapping