The Fajr Fard congregation has begun. When may a person perform the 2 Fajr Sunnah rak'ahs first?

Fajr Sunnah, Joining the Congregation, and Catching a Rak'ah

• When the person reasonably expects to complete them and still catch the congregation.
• Whenever the person prefers praying alone.
• Only after the Fard time ends.
• Never once Iqamah begins.