The angle between the line $x+y=3$ and the line joining the points $(1,1)$ and $(-3,4)$ is

  • A
    $\tan ^{-1}(7)$
  • B
    $\tan ^{-1}\left(-\frac{1}{7}\right)$
  • C
    $\tan ^{-1}\left(\frac{1}{7}\right)$
  • D
    $\tan ^{-1}\left(\frac{2}{7}\right)$

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