WhatarethreecommonreasonsforATMCRCerrors?()

A.IncorrectVPIandVCIconfiguration

B.Noise，gainhits，orothertransmissionproblemsonthedatalinkequipment

C.ATMcellsaredroppedduetoincorrectATMroutingintheserviceprovider.

D.AfaultyorfailingATMinterface.

E.CellsaredroppedduetotrafficpolicingintheATMcloudononeormorevirtualcircuitsattachedtotheATMinterface