Which three actions can occur when an administrator clicks `Save` after making a number of modifications to Knowledge data categories in a category group and changing their positions in the hierarchy? (Choose three.)
- A. Users are temporarily locked out of their ability to access articles
- B. Users may temporarily experience performance issues when searching for articles
- C. The contents of the category drop-down menu change
- D. The articles and questions visible to users' change
- E. The history of article usage is reset to zero utilization
