The range of the following relation R {(3, −5), (1, 2), (−1, −4), (−1, 2)} is

The range of the following relation R {(3, −5), (1, 2), (−1, −4), (−1, 2)} is

a. {−1, 1, 3}
b. {−5, −4, 2}
c. {−1, −1, 1, 3}
d. {−4, −5, 2, 2}