An application for a special vote may be made—
(a) in person by the elector:
(b) by a written application signed by the elector:
(c) by a written application signed on behalf of the elector pursuant to an authority signed by the elector:
(d) in any other manner, if the person issuing the ballot paper is satisfied that the application is made in good faith and that it is not practicable to make it in a manner prescribed by paragraphs (a) to (c).