What is the purpose of the Request Rationalization functional component?

What is the purpose of the Request Rationalization functional component?
A . Presenting service offers to consumers and facilitating consumption and payment
B . Aggregating catalog from various suppliers into consumable Offers that users can order
C . Breaking down and routing requests, and keeping Subscription information up do date
D . Orchestrating the delivery of various requests amongst (one or more) fulfillment engines in order to deliver the IT service

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Answer: D