Which definition best describes the staging plan development service component within the design phase?Select exactly 1

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Which definition best describes the staging plan development service component within the design phase?Select exactly 1 answer(s) from the following:

A. providing a step-by-step plan that details the installation and service-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. improving the network management system and the performance and functionality of infrastructure operations