Which of the Following Statements Is True About Common Illegal

Which of the following statements is true about common illegal uses of patents?

A) A tying arrangement occurs when the patent holder issues a license to use the patented object only if the licensee agrees also to buy some non-patented product from the holder.
B) A tying arrangement occurs when the patent holder issues a license to use the patented object in a manner dictated by the patent holder.
C) Cross-licensing occurs when two patent holders sell their patents to one another.
D) Cross-licensing occurs when a patent holder extends his or her patent to cover a similar object.