Answer:
Ans. Most of the definitions of abnormal behaviour have certain common features often called the four Ds. They are following: (i) Deviance: Psychological disorders are deviant (different, extreme, unusual, even bizarre). (ii) Distress: It means unpleasant and upsetting to the person and to others. (iii) Dysfunctional: It means interference with the persons ability to carry out daily activities in a constructive way. (iv) Dangerous: It means the behaviour is dangerous to the person or to others.
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