单项选择题

There are six phases of the Cisco Network Lifecycle Services framework. What are they?()

A. Prepare, Plan, Design, Apply, Operate, and Manage
B. Prepare, Plan, Design, Implement, Operate, and Optimize
C. Prepare, Plan, Design, Implement, Operate and Manage
D. Prepare, Plan, Create, Implement, Operate, and Improve

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