A customer requires their application to have high availability within a data center, and also the ability to recover at a data center located 600km away in the event of an outage. Which system software solution component supports the customer requirement?（）
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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