单项选择题 If an install of the latest NFS fixes failed, which of the following options provide debug output before running installp?（）

单项选择题 A server is being set up at a client location. The system has been powered up for a clean install of the base OS. The CD is in the drive. After 5 minutes, the system is hung. There is no activity with the CD-ROM drive and nothing to select on the screen. Which of the following procedures should be performed next?（）

单项选择题 Which of the following procedures is safest perform when updating licensed program products?（）