【名词&注释】
服务器(server)、研制成功(successfully developed)、系统可用性(system availability)、电子数字计算机(electronic digital computer)
[单选题]In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode; with higher transmit rate; with the best reliability
A. radio channel
B. fiber optic cable
C. twisted-pair cable
D. coaxial cable