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 problems