The petition may consist of one (1) or more copies, or subcription lists, circulated separately, and the signature thereto may be upon the paper or papers containing the form of petition, or upon any other papers attached. Verifications provided for in the next preceding section of this Article may be made by one (1) or more petitioners, and the several parts or copies of the petition may be filed separately and by different persons; any signatures placed on the petition more than forty-five (45) days prior to the filing of such petition shall be ineffective and not be counted. All papers comprising a recall petition shall be filed with the person performing the duties of City Secretary on the same day, and the Secretary shall immediately notify, in writing, the officer sought to be removed, by mailing notice to his or her Pleasanton address.