单项选择题

Which of the following commands will set the duplex of a network adapter？（）

A.no -a media_speed=100_Full_Duplex en0
B.ifconfig -a media_speed=100_Full_Duplex ent0
C.chdev -l ent0 -a media_speed=100_Full_Duplex
D.chinet -l en0 -a media_speed=100_Full_Duplex en0

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Where are timekeeping services configured？（）

A./etc/services
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