The relation $R$ defined on the set of natural numbers as $\{(a, b) : a$ differs from $b$ by $3\}$, is given by

  • A

    $\{(1, 4, (2, 5), (3, 6),.....\}$

  • B

    $\{(4, 1), (5, 2), (6, 3),.....\}$

  • C

    $\{(1, 3), (2, 6), (3, 9),..\}$

  • D

    None of these

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