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单项选择题Which definition best describes the staging plan development service component within the design phase? 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、improving the network management system and the performance and functionality of infrastructure operations

  • A
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