What is the difference between a "'yield on a bond and a "spot rate"? OA. Yield discounts each cash flow at a unique rate, while spot rates discounts all cash flows at the same rate O B. Both yield and spot rates discount all cash flows at the same rate. C. Yield discounts each cash flow at the same rate, while spot rates discount each cash flow its own rate O A. B. C. O D. O D. Yields are used to discount all coupons and spot rate discounts the principal