Which design phase service component includes the development and documentation of the test case or cases used to verify that a deployed infrastructure meets operational， functional， and interface requirements？ Select exactly 1 answer（s） from the following：（）。

A.providing a step-by-step plan that details the installation and service-commission tasks required in order to create a controlled-implementation environment that emulates a customer network
B.assessing the ability of site facilities to accommodate proposed infrastructure changes
C.developing and executing proof-of-concept tests， validating high-level infrastructure design， and identifying any design enhancements
D.installing， configuring， and integrating systems components based on an implementation plan developed in earlier phases
E.improving a customer’s infrastructure security system

A.site readiness assessment
B.business requirements development
C.design
D.site survey
E.customer education

A.Identify the activities involved in installing and configuring equipment at a customer’s site or sites
B.Describe the day-to-day activities required to support， manage， and monitor a newly implemented system
C.Access current network readiness， site readiness， and operational readiness in preparation for designing a solution proposal
D.Gain an understanding of high-level business and technical requirements