For 2019: Chin Lee (age 42) is single with three minor children (all under age 16), who live with him. Chin has a salary of $80,001, a short-term capital loss of ($2,000), a cash prize of $4,000 from a church raffle, and itemized deductions of $10,500.

Calculate/Answer the following:

a. Chin's optimum filing status

b. Chin's adjusted gross income

c. Chin's taxable income

d. Chin's tax liability before any credits

Show all calculations and label each answer.