Any notice to Employer required or permitted un der this Agreement shall be given in writing to Employer, either by personal service or by registered or certified mail, postage prepaid, addressed to the Chief Executive Officer of Employer, or equivalent, with a copy to the General Counsel of Employer, a t Employer’s then principal place of business.  Any such notice to Executive shall be given in a like manner and, if mailed, shall be addressed to Executive at his home address then shown in Employer’s files.  For the purpose of determining compliance with any time limit in this Agreement, a notice shall be deemed to have been duly given (a) on the date of service, if served personally on the party to whom notice is to be given, or (b) on the third business day after mailing, if mailed to the party to whom the notice is to be given in the manner provided by this Section.