Lewis has been receiving Social Security benefits for a year. He has continued to work part-time. His wife receives Social Security disability benefits. His grandchild who lives with him began receiving supplemental security income (SSI) payments in the current year. When Lewis has his joint return completed for the current year, all the following will be included in the calculation of taxable Social Security Benefits except: Question 7Select one: a. Disability benefits b. Interest on a bond issued by the State of Indiana c. Supplemental security income (SSI) payments d. Monthly retirement benefits