What do you have to keep in mind when working with value hierarchies? Note: There are 2 correct Answers to this question.

What do you have to keep in mind when working with value hierarchies? Note: There are 2 correct Answers to this question.
A . Value nodes are values.
B. Only available for characteristics with CHAR or NUM format.
C. Value nodes are not values.
D. Only available for characteristics with CHAR format.

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Answer: C,D