The following information pertains to Havana Corporation's defined benefit pension plan:

($ in thousands)	2021 Beginning balances				2022 Beginning balances
Projected benefit obligation	$	(6,100	)		$	(6,604	)
Plan assets		5,800				6,436
Prior service costAOCI		610				575
Net lossAOCI	$	730			$	816

At the end of 2021, Havana contributed $715 thousand to the pension fund and benefit payments of $624 thousand were made to retirees. The expected rate of return on plan assets was 11%, and the actuary's discount rate is 8%. There were no changes in actuarial estimates and assumptions regarding the PBO. What is the 2021 service cost for Havana's plan?

Multiple Choice

• $640 thousand.

• $246 thousand.

• Cannot be determined from the given information.

• $520 thousand.