TwoDS8700systemshavebeenproposedforadisk-to-diskBCsolution.Eachsystemhas200TBinstalled，withadatachangerateof18%perday.Two2GbpsCWDMlinksareinplacebetweentheremotedatacenterswithanaverageutilizationrateof55%.TheproposedsolutionincludesadditionalCWDMports.WhichofthefollowingshouldjustifytheadditionalCWDMports（）
A.theDiskMagicconfigurationreport
B.anengineerfromthetelcomprovidingthedarkfiber
C.thebandwidthcalculations
D.aCompeteLineanalysis
参考答案：C
