【单选题】
A5事件的measurementPurpose设置为()时,则LTE到GSM的切换使用A5。
A、Mobility-Inter-RAT-to-GERAN
B、Mobility-Intra-Freq
C、Mobility-Inter-RAT-to-UTRA
D、Mobility-Inter-Freq-to-EUTRA
A、Mobility-Inter-RAT-to-GERAN
B、Mobility-Intra-Freq
C、Mobility-Inter-RAT-to-UTRA
D、Mobility-Inter-Freq-to-EUTRA