单项选择题 Todisablealltcpipdeamonsthatarenotrequiredonaserver，whichofthefollowingfilesshouldbeedited？（）

单项选择题 A system administrator has created tty2 on a serial port connection to a system.  When attempting to verify the connection the following error is observed：   # cu -ml tty2   cu： 0835-028 The connection failed. NO DEVICES AVAILABLE. Which of the following should be performed to correct this error？（）

单项选择题 WhichofthefollowingisTRUEabouttheateprogram？（）