Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.<br>A:connection oriented<br>B:connectionless<br>C:high bandwidth utilization<br>D:poor real-time

Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.
A:connection oriented
B:connectionless
C:high bandwidth utilization
D:poor real-time

出自：系统集成项目管理工程师（中级）

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