An important thing to keep in mind when using the "three ds" to classify abnormal behavior is that: a. none of the criteria by themselves are necessary or sufficient to classify a behavior as abnormal b. all of the criteria must be present to classify a behavior as abnormal. c. each criterion by itself is sufficient to classify a behavior as abnormal. d. though they have been used extensively by psychologists, research suggests that they are a poor way to classify abnormal behavior 1 points save answer