The reign of Caliph Uthman b. Affan is known for
tax collection
Hadith Collection
justice and administrative fairness
standardization of the Qur'an
Correct answer is D
The reign of Caliph Uthman b. Affan is known for the standardization of the Qur'an. He commissioned a committee to produce a standard copy of the text, which is known as the Uthmanic codex.