What is a reservation to a treaty? Group of answer choices According to the Vienna Convention, "a reservation is a unilateral statement, made by a State, when signing, ratifying, accepting, approving or acceding to a treaty, whereby it purports to exclude or to modify the legal effect of certain provisions of the treaty in their application to that State." According to the Vienna Convention, "a reservation is a bilateral statement, made by States, when signing, ratifying, accepting, approving or acceding to a treaty, whereby it purports to exclude or to modify the legal effect of all provisions of the treaty in their application to those States." According to the Vienna Convention, "a reservation is a unilateral statement, made by a State, when signing, ratifying, accepting, approving or acceding to a treaty, whereby it purports to exclude or to modify the moral and customary effects of certain provisions of the treaty in their application to that State." According to the Vienna Convention, "a reservation is a unilateral statement, made by an international non-governmental organization, when signing, ratifying, accepting, approving or acceding to a treaty, whereby it purports to exclude or to modify the legal effect of certain provisions of the treaty in their application to that State