(c) The county board of elections, upon receipt of any application of a qualified elector required to be registered under the provisions of preceding section
1301, shall determine the qualifications of such applicant by verifying the proof of identification and comparing the information set forth on such application with the information contained on the applicant's permanent registration card. If the board is satisfied that the applicant is qualified to receive an official absentee ballot, the application shall be marked "approved." Such approval decision shall be final and binding, except that challenges may be made only on the ground that the applicant was not a qualified elector. Such challenges must be made to the county board of elections prior to
Five o'clock p.m. on the Friday prior to the election : Provided, however, that a challenge to an application for an absentee ballot shall not be permitted on the grounds that the elector used an application for an absentee ballot instead of an application for a mail-in ballot or on the grounds that the elector used an application for a mail-in ballot instead of an application for an absentee ballot.