FriedCo secured a patent for "frying food through the use of hot air in an enclosed cooking device". In FriedCo's fryer, the hot air was created by a tungsten heating element located at the bottom of the fryer. ChipsNStuff decided to create their own version of a fryer which looked very different and where the hot air was created through the use of a halogen tube mounted at the top of the fryer. Which of the following is correct?

A) ChipsNStuff has not infringed the FriedCo patent because of the differences in the location of the heating element.

B) ChipsNStuff has not infringed the FriedCo patent because of the differences in the way the hot air is created.

C) ChipsNStuff has not infringed the FriedCo patent because of the difference in the appearance of the fryer.

D) ChipsNStuff has infringed the FriedCo patent because the patent covers the idea of frying food through the use of hot air in an enclosed cooking device.