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.