Multiple choice

Which of the following is not the circle which passes through the origin and cut offs chords of length a from each of the lines $y=x$ and $y=-x$?

  1. $x^{2}+y^{2}- \sqrt {2}ax=0$
  2. $x^{2}+y^{2} + \sqrt {2}ax- \sqrt {2}ay=0$
  3. $x^{2}+y^{2}- \sqrt {2}ay=0$
  4. $None\ of\ these$
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