(1)An employer may account for a pension plan using a defined-contribution plan or a defined- benefit plan:

(a) In two paragraphs, please explain the difference in these plans and (b) who will bear the risk of loss under each plan.

What entries (debits and credits) will be made by the employer for pension expense under a defined-contribution plan and how will the amount for pension expense be determined

What entries (debits and credits) will be made by the employer for pension expense under a defined-benefit plan and how will the amount for pension expense be determined?

In one paragraph, please explain why some defined benefit plans may have the item prior service cost amortization while another defined benefit plan may not have this line item when calculating pension expense.

please not investopedia or copy pasting thanks