In Nystrom V

In Nystrom v.Trex Company,where Nystrom sued Trex Company for copyright infringement on his patented flooring boards,the appeals court held that:

A) Nystrom's patent was limited to wooden boards and since Trex Company's boards were not wooden,there was no infringement
B) Trex Company's patent was not limited to wooden boards and so the district court's summary judgment of noninfringement could not stand
C) Nystrom's patent had expired
D) Nystrom's patent had been incorrectly granted
E) none of the other choices are correct