From a risk management point of view, the BEST approach when implementing a large and complex IT
infrastructure is:

A.
a big bang deployment after proof of concept.

B.
prototyping and a one-phase deployment.

C.
a deployment plan based on sequenced phases.

D.
to simulate the new infrastructure before deployment.

Explanation:
When developing a large and complex IT infrastructure, the best practice is to use a phased approach to fitting
the entire system together. This will provide greater assurance of quality results. The other choices are riskier
approaches.