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【单选题】
下列有关NBDP设备的描述正确的有（）。①NBDP设备采用七单元恒比码检错；②FEC工作能进行点对面的通信，接收多个电台；③在连续重复16个机器周期后，不能建立通信连路，设备将自动返回到Standby状态；④ARQ工作方式采用自动请求重复方式进行纠错；⑤FEC工作方式采用二重时间分集前向纠错；⑥ARQ通信换流指令是Over指令
A.
①②③⑤
B.
①③⑤⑥
C.
②③④⑥
D.
①④⑤⑥
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