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

Suggest answer: BCD

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