Which of the following commands should be used to open a tty port configured in the /etc/uucp/Devices file as： Direct tty2 - 9600 direct in debug mode， ignoring modem control signal data carrier detect （DCD）？（）
- Acu -l tty2
- Bcu -dml tty2
- Ccu -dht Direct
- Dcu -s9600 -l tty2