All notices, requests, demands and other communications required or permitted under this Agreement shall be in writing and shall be deemed to have been duly given (a) when delivered in person, (b) by facsimile, receipt confirmed, (c) on the next Business Day when sent by overnight courier, or (d) on the third succeeding Business Day when sent by registered or certified mail (postage prepaid, return receipt requested), to the respective Parties at their respective last known address.