What is the legal ruling if the sun rises above the horizon while a person is in the middle of performing the Fajr prayer?

Invalidations of Prayer Part 3: State Transitions and Technical Breaks

• The prayer remains completely valid and can be finished normally.
• Only that specific rak'ah is void, but the rest is valid.
• The prayer is immediately invalidated and must be made up later (Qada').
• The worshipper must perform Sujud al-Sahw.