A system administrator has just installed a new maintenance level， but "oslevel -r" does not show the correct maintenance level. What command can be used to determine which filesets are downlevel？（）

单项选择题AcustomerhasapSeriesthatneedstobeupgradedfromAIXVersion5.1toAIXVersion5.2.Thecustomerwantstoretain etc passwd.Whichofthefollowinginstallationtypesshouldbeused？（）

A.Preservation Install
B.Retention Install
C.Overwrite Install
D.Migration Install

单项选择题AproductionsystemneedstobeupgradedfromAIXV5.1toAIXV5.2.Alllogsandusersneedtobesaved.Whichinstallationmethodwillaccomplishtheupgrade？（）

A.Update Installation
B.Migration Installation
C.Preservation Installation
D.New and Complete Overwrite Installation

单项选择题AsystemadministratorwilluseamksysbfromauniprocessormicrochannelserverrunningAIX5.1toinstallamultiprocessorchrpserver.Whatelseisrequired？（）

A.A 5.1 AIX base media set
B.A 5.1 Additional Device Driver CD
C.A mksysb of the multiprocessor chrp server
D.A savevg of the uniprocessor microchannel server

单项选择题AsystemadministratorwillbemigratingaserverfromAIX5.1toAIX5.2andisuncertainiftheapplicationrunningontheserverwillfunctionproperlyafterthemigration.WhatisthefastestwaytoreturntothepreviousAIXleveliftheapplicationdoesnotwork？（）

A.Use base media to restore system to AIX 5.1.
B.Use an alt_disk_install and boot back to the AIX 5.1 rootvg.
C.Make a mksysb of the original AIX to restore back to the AIX 5.1 level.
D.Perform the AIX 5.2 upgrade using update_all with the commit option and reject filesets to return to AIX 5.1.

单项选择题AsystemadministratorneedstoquicklymigrateamachinefromAIX5.1toAIX5.2.Theadministratorwillonlybeallowedenoughdowntimetorebootthemachine.Whichinstallationmethodshouldbeusedtoaccomplishthistask？（）

A.Perform a migration installation during the reboot process.
B.Perform an alternate disk installation and migration using NIM.
C.Copy the /usr directory from another 5.2 server to this server.
D.Perform an update_all install from 5.2 media to take effect on reboot.