. the atc mexico plan provided for the issuance of options to officers , employees , directors and consultants of atc mexico , however there was no option activity and no outstanding options as of and for the years ended december 31 , 2006 and 2005 . atc south america stock option plan 2014as of december 31 , 2006 , the company maintained a stock option plan for its atc south america subsidiary ( atc south america plan ) which was terminated in february 2007