Find the domain of the relation:

{(-3, -4), (-1, 2), (0, 0), (1, 3), (5, 4)}

a. {-4, 2, 3, 4}

b. {-3,-1, 0, 1, 5}

c. {-4, -3, -1,0, 1, 2, 3, 4, 5}

d. {-4, 0, 2, 3, 4}