Defined contribution plans and defined benefit plans are two common types of pension plans. Choose the correct statement regarding these plans a Select one: o a. The required annual contribution to the plan is determined by formula or contract in a defined contribution plan. b. Both plans provide the same amount of retirement benefits. c. The retirement benefit is usually determinable well before retirement in a defined contribution plan. d. In both types of plans, pension expense is generally the amount funded during the year, a