Answer:
a. Debit deferred revenue and credit service revenue for $9000.
Step-by-step explanation:
Note: The full question is attached as below
Subscription earned for 9 months = $12000 / 12 * 9
Subscription earned for 9 months = $9,000
Date Account titles Debit Credit
Dec 31, 2021 Deferred revenue $9,000
To Service revenue $9,000