Let $x-y=0$ and $x+y=1$ be two perpendicular diameters of a circle of radius $R$. The circle will pass through the origin if $R$ is equal to

  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    $\frac{1}{3}$

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