All notices, requests, demands, and other communications hereunder shall be in writing and shall be deemed to have been duly given if delivered by hand or mailed, certified or registered mail, return receipt requested, with postage prepaid. Unless otherwise changed by notice, notice shall be properly addressed to the Executive if addressed to the address of the Executive on the books and records of the Employer at the time of the delivery of such notice, and properly addressed to the Employer if addressed to the Board, at _________________________________.