YouhaveanExchangeServer2010organization.Yourcompanyslegaldepartmentsendscompliancee-mailme

YouhaveanExchangeServer2010organization.Yourcompanyslegaldepartmentsendscompliancee-mailmessagesbyaddingrecipientstotheblindcarboncopy（Bcc）field.Thecompanyscompliancepolicyincludesthefollowingrequirements：.Alle-mailmessagessenttoexternalrecipientsmustbearchivedinacentralrepository.Complianceofficersmustbeabletoidentifyalltherecipientsofarchivede-mailmessagesYouneedrecommendasolutiontomeetthecompliancepolicyrequirements.Whatshouldyourecommend？（）

A、journalrules

B、messagetracking

C、PersonalArchives

D、transportrules