An investor purchased a bond as a long-term irvestment on Laruary 1 , Annual interest was received on December 31 . The imestor's interest income recorded would decrease eoch year if the bond were parchased at Select one: a Raf b. A discount and the straight line method was used c. A discount, and the effective method was vsed d. A peemian and the effective method was used e. A prernimy and the straght-line method was used