Indigo Ltd. has an executive stock option plan, details of which follow: The plan entitles the CEO to purchase 8,400 common shares at $25 each, following a vesting period. The vesting period is January 1, 2020 through December 31, 2021. The exercise period is January 1, 2022 through December 31, 2022. The CEO exercises 6,100 of the stock options on June 30, 2022. The rest of the options are allowed to lapse. The shares' market prices per share are as follows: January 1, 2020 $25 December 31, 2020 $27 December 31, 2021 $28 June 30, 2022 $30 Indigo uses an option-pricing model to value the stock options. When granted, the options are estimated to have a fair value of $4 each. This estimate remains unchanged during the vesting period. Assuming that Indigo has a December 31 year end, prepare the required journal entries as at the following dates. (Credit account titles are automatically indented when the amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter for the amounts.) (a) January 1, 2020 (grant date) (b) December 31, 2020 (c) June 30, 2022 (exercise date) (d) January 1, 2025 (lapse date) Debit Credit No. (a) Date Jan. 1, 2020 - Account Titles and Explanation No Entry No Entry (b) Dec. 31, 2020 Compensation Expense 21000 Contributed Surplus - Stock Options 21000 (c) Jun 30, 2022 Cash 210000 Contributed Surplus - Stock Options 30500 Common Shares 240500 (d) Jan. 1, 2025 Contributed Surplus - Stock Options 11500 Contributed Surplus - Expired Stock Options 11500