The relation $R$ on the set of natural numbers is defined by $R = \{(a, b) : a = 2b\}$. Then ${R^{-1}}$ is:

  • A
    $\{(2, 1), (4, 2), (6, 3), \dots\}$
  • B
    $\{(1, 2), (2, 4), (3, 6), \dots\}$
  • C
    ${R^{-1}}$ is not defined
  • D
    None of these

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