Any written notice to the Company referred to herein shall be made by mailing or delivering such notice to the Company at 6801 Rockledge Drive, Bethesda, Maryland 20817, to the attention of the Senior Vice President, Human Resources. Any written notice to a Participant shall be made by delivery to the Participant in person, through electronic transmission, or by mailing such notice to the Participant at his or her last-known place of residence or business address.