Ian retired in December of 2021 at the age of 71 (his birthday is January 6). lan's retirement account was valued at $460,000 at the end of 2020 and $470,000 at the end of 2021 . He has had all of his retirement accounts open for 15 years. Note: Leave no answers blank. Enter zero if applicable. What is lan's required minimum distribution for 2022 under each of the following alternative scenarios? (Use Exhibit 13-3) Required: a. lan's retirement account is a traditional 401(k) account. b. Ian's retirement account is a Roth 401(k) account. c. lan's retirement account is a traditional IRA. d. Ian's retirement account is a Roth IRA. EXHIBIT 13-3 Abbreviated Uniform Lifetime Table for Distributions in 2022