What is the key objective of the plan phase？（）

• 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