Concept:In the Sokoto Caliphate, the court system included the Shariah court, which was headed by a specific judicial officer.Explanation:The officer who presided over the Shariah law court was known as the Alkali.This official was responsible for interpreting and applying Islamic law in the caliphate.Other listed officials—Hakimi, Dogari, and Maaji—had different administrative or military duties.Answer:D. Alkali