If the lengths of the tangent, subtangent, normal and subnormal for the curve $y=x^2+x-1$ at the point $(1,1)$ are $a, b, c$ and $d$ respectively, then their increasing order is

• A

  $b, d, a, c$
• B

  $b, a, c, d$
• C

  $a, b, c, d$
• Correct answer
  D

  $b, a, d, c$

Hence, the correct answer is option: 'D'.