The Distinction Between Depression as a Symptom and as a Syndrome

The distinction between depression as a symptom and as a syndrome is

A) a distinction between a negative mood state compared to the negative mood state plus certain other problems that lead to impaired functioning.
B) depression as a symptom of some other disorder compared to depression as a separate disorder.
C) depression as a disorder that occurs by itself compared to depression as a disorder that occurs along with other disorders (e.g., anxiety disorders) .
D) a distinction between depression as manifested in young children compared to depression as manifested in adolescents.