Explanation

The founding of Fustat is historically attributed to a period following the initial conquests, and while Amr bin Al-As was instrumental in establishing early Islamic presence in Egypt, specific historical consensus often points elsewhere or suggests it wasn't founded solely by him among these choices. Hazrat Umar bin Khattab did not found Fustat. Hazrat Khalid bin Walid is known for military campaigns but not the founding of Fustat. None of the above is likely correct if a different founder is historically accepted.