单项选择题 Companycom wants to apply a PTF to the p5 590 system. After doing a preview install, the output shows there is insufficient space in the /usr filesystem. The root volume group has no available physical partitions left. They do not want to add additional disk drives to the system, but have a jfs2 filesystem that is only 8% used. What could they do to utilize space in the jfs2 filesystem to apply this PTF?（）

单项选择题 The System Administrator wants to do a backup of the HMC and notices that there are two options on the HMC menu: Backup Critical Console data and Save Upgrade Data. Which of the following best describes the differences between the two options?（）

单项选择题 A p5 570 customer is currently running AIX 5.3. The customer now wants to add Virtual Ethernet to two of the LPARs. This will enable the application tier can communicate to the database tier without using an external Ethernet card. What is the best way to accomplish this task?（）