When People Are Said to Be Insane, This Means That

When people are said to be insane, this means that:

A) a legal determination has been made that they are incompetent to stand trial and unaware of the consequences of their actions.
B) a diagnosis of schizophrenia has been made either by a psychologist or by a psychiatrist specializing in the treatment of the insane.
C) a psychiatrist has determined that they are suffering from one of the psychological disorders, as described in the DSM.
D) psychologists have compared their behaviours to characteristics of individuals with disorders and found a strong correlation.