Which statement describes an elastically scalable design?
A. The application runtime keeps the load constantly under a certain threshold despite the number of requests received.
B. The system topology of the deployment includes a load balancer which spreads the requests across the server instances that host the application.
C. The application maintains historical load traces which are reviewed evey week to modify the number of server instances that will be deployed for the application for the coming week.
D. Infrastructure level monitoring detects that server utilization for a given application is beyond a certain threshold, provisions additional server instances to host the application, and balances the load.
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