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