Concept:The standardization of al-Qur'ān was carried out by a special committee appointed by Caliph 'Uthmān ibn 'Affān.
Explanation:The well-known members of this committee were Zayd ibn Thābit, 'Abd Allāh ibn al-Zubayr, Sa'īd ibn al-'Āṣ, and 'Abd al-Raḥmān ibn al-Ḥārith ibn Hishām.
Zayd ibn Thābit was the leading scribe of the revelation.
The other three members helped him to produce copies in the Quraysh dialect.
Option A mentions Zayd b. Ḥārith, who was a brave companion of the Prophet but was not part of this standardization committee.
Options B, C, and D are all accepted names among the members of the committee.
Therefore, the correct exception is option A.
Answer:A. Zayd b. Ḥārith