Which of the following commands will set the duplex of a network adapter？（）
- Ano -a media_speed=100_Full_Duplex en0
- Bifconfig -a media_speed=100_Full_Duplex ent0
- Cchdev -l ent0 -a media_speed=100_Full_Duplex
- Dchinet -l en0 -a media_speed=100_Full_Duplex en0