How do big data solutions interact with the existing enterprise infrastructure?

A.
Big data solutions must substitute the existing enterprise infrastructure; therefore there is no
interaction between them.

B.
Big data solutions are only plug-ins and additions to existing data warehouses, and therefore
cannot work with any other enterprise infrastructure.

C.
Big data solutions must be isolated into a separate virtualized environment optimized for
sequential workloads, so that it does not interact with existing infrastructure.

D.
Big data solutions works in parallel and together with the existing enterprise infrastructure, where
pre-existing connectors are used to integrate big data technologies together with other enterprise
solutions.