Indicate the most advantageous filing status for the following taxpayers. Select "Single", "Married, filing jointly", "Head of household", "Married, filing separately" or "Surviving spouse", whichever is applicable.

a$.$ Alfred is single and fully supports his friend who lives in another state.

b$.$ Tedra has two dependent children. Her husband Fred died during the year.

c$.$ James is single and supports his grandmother who lives with him.

d$.$ Archie has one dependent child. His wife died two years ago.