Among the following five types of investments: a. Held-to-maturity, debt investment b. Trading, debt investment C. Available-for-sale, debt investment d. Trading, equity investment e. Available-for-sale, equity investment unrealized holding gains or losses are recorded as other comprehensive income for securities classified as (Enter 1, 2, 3, or 4 that represents the correct answer): 1. c, e 2. a, b, c 3.bd 4. b, c, d, e