Identify the optimal filing status and calculate taxable income for each of the following:

1.) Abby is single and has 2 children ages 12 and 15. Her AGI is $70,000 and her itemized deductions totak $4,000

2.) bob is single and has 2 children, ages 14 aand 20. the 20 year old child attends college full-time and is otherwise supported by bob. bobs agi is $60,000 and his itemized deductions total $7,500

3.) corina is widowed , and her spouse having passed away during the current tax year. she ahs 3 children, ages 14, 16, and 20. the 20 year old child works full time and corina does not provide more than half of the childs support. Corinas AGI is $80,000 and her itemized deductions total $9,500.