Final answer:
The DSM-V classification for Major Depressive Disorder focuses primarily on diagnostic criteria, which include a range of psychological and physical symptoms, without specifically detailing etiology, treatment options, or prognosis.
Step-by-step explanation:
The classification of Major Depressive Disorder (MDD) as outlined in the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) primarily focuses on c) diagnostic criteria. These criteria include a range of symptoms such as a severely depressed mood lasting longer than two weeks, loss of enjoyment in activities, changes in appetite and sleep patterns, difficulty concentrating, feelings of worthlessness, and sui-cidal thoughts. While the exact causes of major depression are still being studied, it involves both genetic and environmental risk factors, and there are various hypotheses regarding the role of neurotransmitters like serotonin and norepinephrine. Treatments for depression, which are also discussed to provide context, include psychotherapy, medication, electroconvulsive therapy, and deep-brain stimulation.