WhatdoestheFastConnectionFailoverfeatureofActiveGridLinkforRACprovide？（）

A.instantnotificationofaRACnodefailuresoapplicationsneverhavetoretryatransactionthatwassenttoanodethatfailedduringthetransaction B.near-instantnotificationofthefailureofaRACnodefailurethatminimizesthepossibilityconnectiontoafailednodebeingprovidedtoanapplication C.applicationlevelnotificationofafailedRACnodesuchthatanapplicationcanretryatransactionifrequired D.fasterfailoverforMultiDatasources E.guaranteedtransactionhighavailabilitywheninteractingwithanOracleRACDatabase