यदि $\lim _{x \rightarrow \infty}\left(\sqrt{x^{2}-x+1}-a x\right)=b$ है,तो क्रमित युग्म $(a, b)$ है:

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

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