Renewal evidence supports the ten-year life. Topic 730 governs the stated development activity but excludes patent litigation, so another applicable rule must decide the legal cost.
The renewal evidence matters to useful life, and ownership of the existing patent does not supply the scope and recognition rule for later activities.
The useful-life and R&D conclusions are supported, but a successful outcome does not by itself supply the recognition rule for patent-litigation cost.
Expected economic use is ten years, and Topic 730 explicitly excludes patent litigation from its R&D activities.
Answer: a
Choice a. Use the supported ten-year useful life. Expense the stipulated product-development activity under Topic 730. Do not decide the patent- litigation cost from the lawsuit outcome alone. Topic 730 excludes that legal work from its scope, so identify and apply the guidance governing the legal service and the patent before changing the patent's carrying amount.