You are designing an application by using Microsoft .NET Framework 4 and Microsoft
Visual Studio 2010. The application includes Windows Workflow Foundation (WF) hosts that
run thousands of workflow instances. Workflows usually take 2 hours of time to complete.
The application also includes a Windows Communication Foundation (WCF) service that
contains a method to check the completion status of a workflow stored in a database.
External applications that use the WCF service to check the status of workflows every
minute causes performance degradation of the workflow that hosts the application. You
need to eliminate the performance degradation caused by workflow status checks. What
should you do?

A.
• Cache the status of the workflow. • Assign a callback function based on a
SqlDependencyobject. • Reload the cache in the callback function.

B.
• Cache the status of the workflow. • Set the expiry time of the Cache object to 30
minutes.

C.
• Create a status checking workflow. • Return the status of the original workflow to the
external application in 30 minute intervals.

D.
• Create a status checking workflow. • Return the status of the original workflow to the
external application after 10 requests have been made.

Explanation: