Concept:Al-Ṣiḥāḥ al-Sittah refers to the six most authentic Sunni hadith collections.Explanation:These six books are considered the most reliable sources of hadith after the Qur’an.They include Sahih al-Bukhari, Sahih Muslim, Sunan Abi Dawud, Sunan Ibn Majah, Sunan al-Tirmidhi, and Sunan al-Nasa’i.Among the given options, only An-Nasa’i is one of the six compilers.He is the author of Sunan al-Nasa’i, also known as Sunan al-Sughra.Answer:C. An-Nasa’s (Al-Nasa’i)