3. Which of the following individuals are required to file a federal income tax return? a. Kyra (age 30) is married to George (age 71). Together they have a combined Adjusted Gross Income in 2020 of $25,200? 1 b. Zhou is single (age 28) and lives alone. She has an adjusted gross income in 2020 of $13,600? c. Lindsey started her own business in early 2020 and has no income from any other source. Lindsay's business generated $17,000 of gross income and incurred $14,600 in total expenses during 2020