A client with Premenstrual dysphoric disorder (PMDD) asks how her condition differs from premenstrual syndrome (PMS). What is the nurse's best response?

“PMDD requires hormonal therapy, while PMS does not.”

“PMDD causes only physical symptoms, while PMS involves mood changes."

"PMDD symptoms resolve immediately after menstruation begins."

"PMDD is a more severe form of PMS that significantly interferes with daily functioning."