Whichtwostatemetsaretrue?()A.DPT/RPRusesabi-directionalringconsistingoftwosymmetriccounterrotatingfibrerings.B.DPT/RPRisdefinedintheIEEE802.17standardanditusesTokenBucketsystemtoavoidcollisions onthefiber.C.InDPT/RPRrings，datapacketscanbesentinonedirectio

A.DPT/RPRusesabi-directionalringconsistingoftwosymmetriccounterrotatingfibrerings.

B.DPT/RPRisdefinedintheIEEE802.17standardanditusesTokenBucketsystemtoavoidcollisions onthefiber.

C.InDPT/RPRrings，datapacketscanbesentinonedirection（downstream）andthecorresponding controlpacketsintheoppositedirection（upstream），thususingbothfibresconcurrentlytomaximise bandwidth.

D.DPT/RPRcanbedeployedintheCoreoftheSPnetworkswherepoint-to-pointPOSlinksareusedtomakebestuseoftheBandwidth.