How must the queue sizes be designed to ensure that an application functions correctly?

How must the queue sizes be designed to ensure that an application functions correctly?
A . Each individual device queuing delay in the chain must be less than or equal to the application required delay.
B . The queuing delay on every device in the chain must be exactly the same to the application required delay.
C . The default queue sizes are good for any deployment as it compensates the serialization delay.
D . The sum of the queuing delay of all devices plus serialization delay in the chain must be less than or equal to the application required delay.

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Answer: D