Riser Corporation Was Granted a Patent on a Product on January

Riser Corporation was granted a patent on a product on January 1, 1998. To protect its patent, the corporation purchased on January 1, 2007 a patent on a competing product which was originally issued on January 10, 2003. Because of its unique plant, Riser Corporation does not feel the competing patent can be used in producing a product. The cost of the competing patent should be

A) amortized over a maximum period of 20 years.
B) amortized over a maximum period of 16 years.
C) amortized over a maximum period of 11 years.
D) expensed in 2007.