The Poverty Line in the U

The poverty line in the U.S.is measured by the federal government using which of these formulas?

A) the median cost of rent based on one's geographic region multiplied by two
B) the cost of a nutritionally adequate food plan multiplied by three
C) the median cost of rent in one geographic region plus the standard cost for a nutritionally adequate food plan times number of people in household
D) the sum total of the average cost for the four major household expenses: transportation,housing,food,and child care