单项选择题 Which of the following techniques is used to extract the /usr/tmp directory from a mksysb backup?（）

单项选择题 Which of the following sequence of commands extracts the third image from a tape that was created using the backup command?（）

单项选择题 A system has a TCPIP issue that is a known problem. The newest code from the support website has been downloaded to resolve the issue. Which of the following commands should be used to install the new code?（）