Article 48 the Vienna Convention considers error or mistake a reason to invalidate a treaty. The state practice, however, is scanty in this regard. All the recorded instances in which errors were alleged to have invalidated certain treaties were related to geographical errors, and mostly errors in maps. Both the ICJ and the PCIJ have had the occasion to consider the pleas of error, which were rejected. This is evident in the Temple of Preah Vihear case (Cambodia v. Thailand, 1962) and the Mavrommatis case (Greece v. United Kingdom, 1924). The correct answer is D.