MCQ

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Let $f:\left[ {2,5} \right] \to \left[ {2,5} \right]$ be a bijective function such that $\frac{d}{{dx}}\left( {{f^{ - 1}}\left( x \right)} \right) > 0\ \forall x \in \left[ {2,5} \right]$, then $\int\limits_2^5 {\left( {f\left( x \right) + {f^{ - 1}}\left( x \right)} \right)} dx$ is

• A
  $0$
• B
  $4$
• C
  $25$
• ✓
  $21$