Ariel has two children, Christopher and Pat. Christopher is 25 years old and Pat is 22. Both are full time students at Southern College, have full tuition scholarships, and live at school during the year. Christopher graduated in June. Which test will prevent Ariel from claiming both Pat and Christopher as dependents?

a. Age test.

b. Gross income test.

c. Principal residence test.

d. Non-support test.

e. Full time student test.