In 2016, Sheryl is claimed as a dependent on her parent's tax return. Her parents' ordinary income marginal tax rate is 35%. Sheryl did not provide more than half her own support. What is Sheryl's tax liability for the year in each of the following alternative circumstances?

a. She received $7,000 from a part-time job. This was her only source of income. She is 16 years old at year-end.

b. She received $7,000 of interest income from corporate bonds she received several years ago. This is her only source of income. She is 16 years old at year-end.

c. She received $7,000 of interest income from corporate bonds she received several years ago. This is her only source of income. She is 20 years old at year-end and is a full-time student.

d. She received $7,000 of qualified dividend income. This is her only source of income. She is 16 years old at year-end.