During a psychology class discussion on the difficulties inherent in diagnosing psychological disorders, students examine the efficacy of various criteria used to determine what constitutes abnormal behavior. One student asserts that an individual's ability to function in daily life is a critical aspect of defining a psychological disorder, while another counters with the notion that societal norms and expectations exclusively govern definitions of abnormality. Drawing on your knowledge of the multifaceted approaches to classifying psychological disorders, which of the following statements accurately encapsulates the most comprehensive understanding of defining psychological disorders?