WhenBGPtuningisused，howispacketflowintothee-commercemodulecontrolled？（）
A. bytrackingthestatusofobjectsalongthepathtothee-commercemodule
B. bydetectingundesirableconditionsalongthepathtothee-commercemodule
C. byusingtheMEDtocommunicatethesitepreferencesfortraffictomultipleISPs
D. bycommunicatingtheavailableprefixes，routingpolicies，andpreferencesofeachsitetoitsISP
E. bymovingtheSLBtoapositionwhereselectedtraffictoandfromtheserversdoesnotgothroughtheSLB
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