Refertotheexhibit.HSRPhasbeenconfiguredandlinkAistheprimaryroutetorouterR4.WhenlinkAfails，routerR2（linkB）becomestheactiverouter.WhichrouterwillassumetheactiverolewhenlinkAbecomesoperationalagain？"（）
A.TheprimaryrouterR1willreassumetheactiverolewhenitcomesbackonline.
B.ThestandbyrouterR2willremainactiveandwillforwardtheactiveroletorouterR1onlyintheeventofitsownfailure.
C.ThestandbyrouterR2willremainactiveandwillforwardtheactiveroletorouterR1onlyintheeventoflinkBfailure.
D.ThethirdmemberoftheHSRPgroup，routerR3，willtakeovertheactiveroleonlyineventofrouterR2failure.
正确答案：参考A
