CPA Associates, a cash-basis partnership with a calendar tax year, signs a contract for a 20-month subscription to an online tax research service, effective as of April 1. The firm pays the full $10,000 subscription bill on the April 1, 2021 subscription start date. For 2021 the firm can deduct:

The answer is 10,000. Please explain this answer. I thought the 12 month rule requires: 1) Contract period not to exceed one year, AND 2) the contract period not to extend more than one year after year payment was made.