What are the lengthwise physical boundaries of the face that must be washed in Wudu?

Wudu: The Four Obligatory Pillars

• From the center of the forehead to the throat.
• From the normal hairline at the top of the forehead to the bottom of the chin.
• From the eyebrows to the bottom of the chin.
• There are no specific boundaries; washing any part of the face is valid.