What is the primary Wudu rule for an excused person (Ma'dhur) such as a woman with Istihadah or a man with urinary incontinence?

Post-Natal Bleeding (النفاس) & Chronic Bleeding (الاستحاضة)

• They must perform a fresh Ghusl for every prayer.
• They must perform a fresh Wudu for the time of every obligatory prayer.
• They are exempt from Wudu entirely.
• They only perform Wudu once a day.