Joshua Has Income Endowment of $1,000,the Price of Food Is $$2 \mathrm {~F} + 4 \mathrm {~N} \leq 1,000$$

Joshua has income endowment of $1,000,the price of food is $2 per unit and the price of non-food is $4 per unit.Which of the following is his budget constraint?

A) $$2 \mathrm {~F} + 4 \mathrm {~N} \leq 1,000$$
B) $$F \leq 500 - 2 N$$
C) $$N \leq 250 - 1 / 2 F$$
D) All of the above