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