All notices and other communications under this Agreement or in connection herewith shall be in writing and shall be given by delivery in person or by overnight courier, by registered or certified mail (return receipt requested and with postage prepaid thereon) or by facsimile or Electronic Transmission to the parties at the respective addresses set forth in Exhibit A (or at such other address as any party shall have furnished to the others in accordance with the terms of this Section 12.1 ). All notices and other communications that are addressed as provided in or pursuant to this Section 12.1 shall be deemed duly and validly given (a) if delivered in person or by overnight courier, upon delivery, (b) if delivered by registered or certified mail (return receipt requested and with postage paid thereon), 72 hours after being placed in a depository of the United States mails and (c) if delivered by facsimile or Electronic Transmission, upon transmission thereof and receipt of the appropriate answerback.