The domain of the following relation r {(3, −2), (1, 2), (−1, −4), (−1, 2)} is
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The domain of the following relation R {(3, −2), (1, 2), (−1, −4), (−1, 2)} is
A: {-1, 1, 3}
B: {-1, -1, 1, 3}
C: {-4, -2, 2, 2}
D: {-4, -2, 2}