A biography of a saint or a religious leader is known as :

Hagiography

The correct answer is Option (4) → Hagiography

Hagiography is a biography of a saint or religious leader.

Hagiography is a biography of a saint or religious leader. Hagiographies often praise the saint’s achievements, and may not always be literally accurate. They are important because they tell us about the beliefs of the followers of that particular tradition.