The relation $R$ is defined as $R = \{(4, 5), (1, 4), (4, 6), (7, 6), (3, 7)\}$. Then $R^{-1} o R$ is:

  • A
    $\{(1, 1), (4, 4), (4, 7), (7, 4), (7, 7), (3, 3)\}$
  • B
    $\{(1, 1), (4, 4), (7, 7), (3, 3)\}$
  • C
    $\{(1, 5), (1, 6), (3, 6)\}$
  • D
    None of these

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