Let $R$ be the set of all real numbers and $f(x)=\sin ^{10} x\left(\cos ^8 x+\cos ^4 x+\cos ^2 x+1\right)$ $x \in R$. Let  $S=\{\lambda \in R$ there exists a point $c \in(0,2 \pi)$ with $\left.f^{\prime}(c)=\lambda f(c)\right\}$ Then,

  • [KVPY 2020]
  • A

    $S=R$

  • B

    $S=\{0\}$

  • C

    $S=[0,2 \pi]$

  • D

    $S$ is a finite set having more than one element

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