All notices, claims, certificates, requests, demands and other communications hereunder shall be in writing and shall be deemed to be duly given (a) when personally delivered, (b) if mailed registered or certified mail, postage prepaid, return receipt requested, on the date the return receipt is executed or the letter is refused by the addressee or its agent, (c) if sent by overnight courier which delivers only upon the signed receipt of the addressee, on the date the receipt acknowledgment is executed or refused by the addressee or its agent or (d) if sent by facsimile or electronic mail, on the date confirmation of transmission is received (provided that a copy of any notice delivered pursuant to this clause (d) shall also be sent pursuant to clause (a), (b) or (c)), in each case, to such Party at the address or facsimile number set forth below, or to such other address or facsimile number for a Party as it shall have specified by like notice.