Answer:
The payment to Sunland will increase the cash account of Sunland by $15,360.
It will also increase the liability account of Unearned Service revenue because Sunland has been paid for a service hat they have not rendered yet.
In December, they would have earned part of that money as 6 months would have elapsed.
Assuming the insurance is per month, for 2017, the revenue earned would be;
= 15,360 * 6/24 months
= $3,840
This amount will be sent to revenue on Dec. 31 and debited from the Unearned service revenue account to reduce that liability.