Notices under this Agreement shall be in writing and shall be deemed to have been duly given (i) when personally delivered, (ii) when forwarded by Federal Express, Airborne, or another private carrier which maintains records showing delivery information, (iii) when sent via facsimile but only if a written facsimile acknowledgment of receipt is received by the sending party, or (iv) when placed in the United States Mail and forwarded by registered or certified mail, return receipt requested, postage prepaid, addressed to the party to whom such notice is being given or such other address as furnished to the Company from time to time for this purpose.