Which of the following is a requirement that must be satisfied in order for a legally married taxpayer to use the head of household filing status? 1. The taxpayer must file a separate tax return from the spouse. 2. The taxpayer must furnish over one-half of the cost of maintaining the household. 3. The spouse must not be a member of the household during the last six months of the tax year. 4. The taxpayer must be legally separated from the spouse.

a. 2 only.

b. 4 only.

c. 3 and 4.

d. 1, 2 and 3.