On October 1, 2018, Northern Inc. purchased a patent for $210,000 cash. Although the patent gives legal protection for 20 years, the patent is expected to be used for only 10 years. The patent has no residual value. What will be the balance in the patent account on September 30, 2019? O A. $105,000 O B. $210,000 OC. $189,000 OD. $199,500