अंतराल $\left[-\frac{\pi}{4}, \frac{3 \pi}{4}\right]$ में $\sec ^{-1}\left(\frac{1}{4} \sum_{k=0}^{10} \sec \left(\frac{7 \pi}{12}+\frac{k \pi}{2}\right) \sec \left(\frac{7 \pi}{12}+\frac{(k+1) \pi}{2}\right)\right)$ का मान क्या है?

  • A
    $0$
  • B
    $5$
  • C
    $8$
  • D
    $9$

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