Inmultipointnetworks,therearetreepersistencemethodswhenastationfindsachannelbusy.inthe1-persistentmethod,afterthestationfindsthelineidle,itsendsitsframeimmediately.thismethodhasthe(请作答此空)chanceofcollisionbecausetwoormorestationsmayfindtheline()andsendtheirframesimmediately.Inthenonpersistentmethod,astationthathasaframetosend()theline.Ifthelineisidle,itsendsimmediatelyIfthelineisnotidle,itwaitsa()amountoftimeandthensensesthelineagain.Thenonpersistentapproach()thechanceofcollisionbecauseitisunlikelythattwoormorestationswillwaitthesameamountoftimeandretrytosendsimultaneouslyThep-persistentapproachcombinestheadvantagesoftheothertwostrategies.Itreducesthechanceofcollisionandimprovesefficiency.
A.the lowest B.the highest C.possible D.no正确答案B
