The following information pertains to Havana Corporation's defined benefit pension plan: ($ in 000s) 2018 2019 Beginning balances Beginning balances Projected benefit obligation $ (6,000) $ (6,504) Plan assets 5,760 6,336 Prior service cost-AOCI 600 552 Net loss-AOCI 720 786 At the end of 2018, Havana contributed $696 thousand to the pension fund and benefit payments of $624 thousand were made to retirees. The expected rate of return on plan assets was 10%, and the actuary's discount rate is 8%. During the year, there were no changes in actuarial estimates and assumptions regarding the PBO and no amendments of the pension plan. What is the 2018 pension expense for Havana's plan? O $606 thousand. O $678 thousand. O $594 thousand. O $528 thousand