In the plan phase， network readiness assessment addresses which customer need？ Select exactly 1 answer（s） from the following：（）。

A. an assessment of the preparedness of the customers existing system infrastructure to support a propose solution
B. a comprehensive design that has been customized based on the operations processes， network management processes， and tools of its system
C. an in-depth assessment of the operational environment required to support the operation of both the current and planned solutions
D. the optimal technologies for supporting its business requirements and objective