Which definition best describes the staff training service component within the implement phase？ Select exactly 1 answer（s） from the following：（）。
A. improving the network management system and the performance and functionality of infrastructure operations
B. 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
C. developing and implementing a training plan using classes， workshops， or c-learning courses
D. compiling a training manual for use in ongoing operations
E. reducing the risk of downtime due to facilities-related problem
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