In 2002, Company XX developed a patent, which has a 20 year legal life, and a 10 year useful life. How should Company XX account for the research and development costs (for scientists salaries) that were incurred to develop the patent?

A) capitalize and amortize over a 10 year period.

B) expense as incurred.

C) capitalize and amortize over a 20 year period.

D) capitalize, but do not amortize.

PLEASE EXPAIN IN DETAIL. THANKS IN ADVANCE.