How Does Persistent Depressive Disorder Compare to Major Depressive Disorder

How does persistent depressive disorder compare to major depressive disorder?

A) Symptoms are much more severe than in major depressive disorder.
B) Symptoms change from day to day, with lots of days with normal functioning in between dysthymic episodes.
C) There are many more symptoms required to meet persistent depressive disorder than to meet major depressive disorder.
D) Symptoms are mild to moderate but last for much longer than in major depressive disorder.