单项选择题 How can a JFS2 filesystem be added to a volume groupthat has insufficient space to host a log LV?（）

单项选择题 A recently installed package needs to be rolled back to aprevious version. Which of the following commands will perform the task?（）

单项选择题 A non-root user can run rsh commands from serverA to serverB, but attempts to run rsh commands by the root user return with apermission error message. What action will resolve the problem?（）