Brenner, Inc. computes its December 31, 2020 projected benefit obligation using a 4% discount rate and its December 31, 2021 projected benefit obligation using a 5% discount rate. a. The change in discount rate would cause an actuarial gain in 2022. b. 2021 service cost would be computed with the 5% rate. c. 2021 interest cost would be computed with the 4% rate. d. The change in discount rate would cause an actuarial loss in 2021.