A production system needs to be upgraded from AIX V5.2 to AIX V5.3. All system logs and users need to be saved. Which installation method will accomplish the upgrade（）
1、若a=5，b=3，c=4，逻辑表达式!（a+b）&；&；!c的值
若a=5，b=3，c=4，逻辑表达式!（a+b）&；&；!c的值为（）A0B-1C1D2
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