Which of the Following Best Expresses the Rule About Using

Which of the following best expresses the rule about using negative terms in definitions?

A) No definition should ever have any negative terms in it.
B) Every definition should have at least one negative term so that we know what is excluded from it.
C) Negative terms are usually okay, but should be avoided if they are confusing.
D) Negative terms are usually to be avoided, but are okay when defining inherently negative concepts.
E) A definition should never have two negative terms, since that would be a double negative.