问题：
[单选题] Circuit-switching technology is used in Public Switched Telephone Network（PSTN）, Global System for Mobile Communications（GSM） and Code Division Multiple Access（CDMA）. It is a （ ） information transfer
A、Connection oriented
B、connectionless
C、High bandwidth utilization
D、Poor-real-time
参考答案：
A、Connection oriented
● 参考解析
