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Let \( X=\{1,2,3,4,5,6\} \) and \( Y=\{1,3,5,7,9\} \). Which of the following is/are relations from \( X \) to \( Y \) ?
(a) \( R_{1}=\{(x, y): y=2+x, x \in X, y \in Y\} \)
(b) \( R_{2}=\{(1,1),(2,1),(3,3),(4,3),(5,5)\} \)
(c) \( R_{3}=\{(1,1),(1,3),(3,5),(3,7),(5,7)\} \)
(d) \( R_{4}=\{(1,3),(2,5),(2,4),(7,9)\} \)
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