You are designing a Windows Azure application.
The application includes two web roles and three instances of a worker role.
The web roles will send requests to the worker role through one or more Windows Azure Queues.
You have the following requirements:

– Ensure that each request is processed exactly one time.
– Minimize the idle time of each worker role instance.
– Maximize the reliability of request processing.

You need to recommend a queue design for sending requests to the worker role.
What should you recommend?

A.
Create a single queue.
Send requests on the single queue.

B.
Create a queue for each web role.
Send requests on all queues at the same time.

C.
Create a queue for each worker role instance.
Send requests on each worker queue in a round robin.

D.
Create a queue for each combination of web roles and worker role instances.
Send requests to all worker role instances based on the sending web role.