Which of the following statements is NOT part of the functional definition of a content delivery network$($CDN$)?$

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Part $1$

A$.$

It is used to store and deliver content that changes frequently.

B$.$

It is considered a specialized type of PaaS.

C$.$

It replicates articles on$$ servers, possibly$$ worldwide, so as to minimize latency.

D$.$

It makes data available on demand.

E$.$

It is a system of hardware and software that stores user data in many different geographical locations.