The Kia web site has a chart that shows all the specs for all four Telluride trims. It shows that the S, EX and SX all include "Front and Rear Skid Plate, Premium Silver Finish". When I use the Kia web site to build an EX, it shows a front skid plate as a $350 option. Since front and rear skid plates are standard equipment, what is the optional skid plate?