（单选题）
A customer claims that while redeploying a web application in the production system all their customers are having to log in again. What do you recommend? （）
ASessions can't be preserved when redeploying applications. The customer needs to consider redeployment during late nights when the traffic is low.
BChange the flag responsible for the development mode of their environment. In the production mode, all sessions are preserved while redeploying application.
CChange Hotspot to JRockit. Sessions can't be preserved on HotSpot when redeploying application.
DUse flag -version when redeploying the application. This will switch on the Side By Side deployment feature and preserve existing sessions.
EOpen a service request with Oracle Support. This is unexpected behavior. Sessions are preserved without any extra settings.
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答案解析
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