Any notices or other communications required or allowed to be made or given to the Company under the terms of this Grant Agreement shall be addressed to the Company in care of its President at its offices at 2800 Rockcreek Parkway, North Kansas City, Missouri 64117, and any notice to be given to Optionee shall be addressed to Optionee at Optionee’s address on record with the Company. Either Company or Optionee may from time to time change the address to which notices are to be sent to Company or Optionee, respectively, by giving written notice of such change to the other. Any notice hereunder shall be deemed to have been duly given five business days after registered and deposited, postage and registry fee prepaid, in a post office regularly maintained by the United States Government.