How many rak'ahs are prayed for one who enters the mosque after the Fajr adhan?

Question:
May Allah reward you with good and do you well. He says: I observed that when the worshippers enter the mosque for the Fajr prayer, they pray only two rak'ahs. Is this considered a voluntary prayer or the greeting of the mosque? Or do the two rak'ahs of voluntary prayer suffice for the greeting of the mosque? I have learned that there are two rak'ahs prayed before Fajr as a regular voluntary prayer. Does all of this combine into just two rak'ahs?

Answer:
If he enters the mosque and Fajr has already risen, he suffices with the regular voluntary prayer. He suffices with the regular voluntary prayer before the Fajr prayer, and it suffices for the greeting of the mosque. Pray the regular voluntary prayer, and it suffices for the greeting of the mosque. However, if he enters the mosque early before Fajr rises, he prays the greeting of the mosque and whatever is easy for him. When Fajr rises, he prays the two rak'ahs of Fajr, which are the regular voluntary prayer.