Which one of the following statements is correct regarding what is considered an abnormal behaviour?

a. Behaviour that is maladaptive is an example of abnormal behaviour.
b. Irrational behaviour that has no clear benefit is an example of abnormal behaviour.
c. Behaviour that is contrary to societal standards is an example of abnormal behaviour.
d. A single behaviour is insufficient to determine whether a behaviour is abnormal.
e. Dangerous behaviour that impacts one’s own wellbeing is an example of abnormal behaviour.