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
- DNone of these
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