Upon an application being lodged with the appropriate authority, by or on behalf of the person concerned, in the manner prescribed by the national law, subject to the provisions of paragraph 2 of this article, no such application may be rejected. A Contracting State which provides for the grant of its nationality in accordance with subparagraph (b) of this paragraph may also provide for the grant of its nationality by operation of law at such age and subject to such conditions as may be prescribed by the national law.