On November 1, 2017, Columbo Company adopted a stock-option plan that granted options to key executives to purchase 30,000 shares of the company's $10 par value common stock. The options were granted on January 2, 2018, and were exercisable 2 years after the date of grant if the grantee was still an employee of the company. The options expired 6 years from date of grant. The option price was set at $40, and the fair value option-pricing model determines the total compensation expense to be S450.000 All of the options were exercised during the year 2020: 20,000 on January 3 when the market price was $67, and 10,000 on May 1 when the market price was $77 a share nstructions Prepare journal entries relating to the stock option plan for the years 2018, 2019, and 2020. Assume that the employee performs services equally in 201:8 and 2019.