Wording of Tashahhud

Q 1: Is this wording of Tashahhud (a recitation in the sitting position in the second/ last unit of Prayer) authentically reported: "Greetings belong to Allah; pure actions belong to Allah; good words and prayers belong to Allah. O Prophet! Peace be upon you, the Mercy of Allah, and His Blessings. Peace be upon us and on the righteous servants of Allah. I testify that there is no Ilah (god) except Allah; and I testify that Muhammad is His servant and Messenger"? This is the wording taught to primary school students.

A: This Hadith was related by Al-Nasa'y in "Al-Sunan Al-Kubra", Malik in "Al-Muwatta'", and Al-Shafi`y in "Al-Risalah". Al-Zayla`y said about it in "Nasb Al-Rayah", vol. 1, p. 422, that its Isnad (chain of narration) is Sahih (authentic).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.