Let $R = \{( P , Q ) \mid P \text{ and } Q \text{ are at the same distance from the origin} \}$ be a relation. Then the equivalence class of $(1, -1)$ is the set:

  • A
    $S = \{( x , y ) \mid x ^{2}+ y ^{2}=4\}$
  • B
    $S = \{( x , y ) \mid x ^{2}+ y ^{2}=1\}$
  • C
    $S = \{( x , y ) \mid x ^{2}+ y ^{2}=\sqrt{2}\}$
  • D
    $S = \{( x , y ) \mid x ^{2}+ y ^{2}=2\}$

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