9.2 Any notice shall be deemed to have been duly g iven:   (a) if delivered personally, at the time of delivery at the address referred to in Clause 11.1;  (b) if delivered by commercial courier, at the time of signature of the courier's receipt;  (c) if delivered by email, at the date and time indicated on such email; or  (d) if sent by fax, at the time of transmission.