Which definition best describes the implementation service component within the implement phase?

A.
providing a step-by-step plan that details the installation andservicE.commission tasks required in order to create a controlleD.implementation environment that emulates a customer network

B.
assessing the ability of site facilities to accommodate proposed infrastructure changes

C.
developing and executing proof-of-concept tests, validating high-level infrastructure design, and identifying any design enhancements

D.
Installing, configuring and integrating systems components based on an implementation plan developed in earlier phases

E.
improving a customer’s infrastructure security system