根据以下的配置,请判断当主接口serial0出故障后,哪一个备份接口最先被启用。() Quidway(config-if-Serial0)#backup interfaceserial130 Quidway(config-if-Serial0)#backup interfaceserial240 Quidway(config-if-Serial0)#backup logic-channel350 Quidway(config-if-Serial0)#backup logic-channel235