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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? （）
A:Sessions can't be preserved when redeploying applications. The customer needs to consider redeployment during late nights when the traffic is low.  
B:Change the flag responsible for the development mode of their environment. In the production mode, all sessions are preserved while redeploying application.  
C:Change Hotspot to JRockit. Sessions can't be preserved on HotSpot when redeploying application. 
D:Use flag -version when redeploying the application. This will switch on the Side By Side deployment feature and preserve existing sessions.
E:Open a service request with Oracle Support. This is unexpected behavior. Sessions are  preserved without any extra settings.

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出自：Oracle认证

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