An Important Thing to Keep in Mind When Using the "Three

An important thing to keep in mind when using the "Three Ds" to classify abnormal behaviour is that:

A) although they have been used extensively by psychologists,research suggests that they are a poor way to classify abnormal behaviour.
B) each criterion by itself is sufficient to classify a behaviour as abnormal.
C) all of the criteria must be present to classify behaviour as abnormal.
D) none of the criteria by themselves are necessary or sufficient to classify a behaviour as abnormal.