In which of these phases is a customers current network infrastructure assessed？（）

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 objectives

A.improve the skill sets of its staff members
B.increase the value of and return on investment for its networks
C.increase network staff productivity
D.increase the amount of server room rack space
E.improve network availability， resiliency， security， and scalability
F.increase the amount of time required to integrate network changes

A.reduce unnecessary disruption， delays， rework， and other problems by establishing test cases for use in verifying that the system meets operational， functional， and interface requirements
B.improve its ability to make sound financial decisions by developing a business case based on its business requirements and establishing a basis for developing a technology strategy
C.reduce operating costs and limit change-related incidents by providing a consistent and efficient set of processes
D.improve the return on investment and hasten migration by identifying and planning for necessary infrastructure changes and resource additions， as well as reduce deployment costs by analyzing gaps early in the planning process to determine what is needed to support the system