Any notice hereunder by the holder of this Option shall be given to the Company in writing and such notice and any payment hereunder shall be deemed duly given or made only upon receipt thereof at the Company’s principal office in Houston, Texas, or at such other place as the Company may designate by written notice to the holder of this Option. Any notice or other communication hereunder to the holder of this Option shall be in writing and shall be deemed duly given if mailed or delivered to the holder at such address as he or she may have on file with the Company.