What should be taken into account for names of characteristics? Note: There are 3 correct Answers to this question.

What should be taken into account for names of characteristics? Note: There are 3 correct Answers to this question.
A . The name is purely numeric and must be assigned internally.
B. The following are allowed: Letters, figures, underscore, and hyphen.
C. If the name contains a hyphen, a keyword SKEY is required in the syntax of object dependencies.
D. The name must start with a letter and must be assigned externally.
E. You can change the name at any time later.

Answer: B,C,D