What is a pension plan as used in a firm and related to employee compensation? What is the difference between a defined contribution plan and a defined benefit plan? What is accumulated benefit obligation and how is such associated with a projected benefit obligation? What is the funded status and where is it reported? How does a firm report post-retirement benefits in accounting statements? What is an actuary and what is the actuary's duty in this process? Provide a discussion of all potential scenarios and the relevant accounting requirements.