Huawei's training and certification services run through the entire service life cycle, is the following statement about the best period for training development correct?
A. AIn the early stage of project establishment, customers actively guide customers to choose Huawei planning and design training, and other types of training do not need guidance
B. BAfter the customer completes the project, the customer will be guided to choose Huawei planning and design training
C. CDuring the implementation of the customer project, guide the customer to choose Huawei's full-solution product technical training
D. DThroughout the entire project operation cycle, customers can be guided to choose Huawei training and certification services