单项选择题
Which of the following kdb subcommands should be entered to obtain information about a serial port?（）
A. tty B. stat C. trace D. stream
单项选择题 Whichlogfileshowspreviousinstallationinformation?（）
单项选择题 Whichofthefollowingcommandsshouldbeusedtoobtainadetailedoutputofthesystemerrorlog?（）
单项选择题 Communicationwitharemotehosthasfailed.WhichcommandisLEASThelpfulinisolatingthefailure?（）
