माना $n$ एक धनात्मक पूर्णांक है जिसके लिए $\sin \frac{\pi }{2^n} + \cos \frac{\pi }{2^n} = \frac{\sqrt{n}}{2}$ है। तो

  • A
    $6 \le n \le 8$
  • B
    $4 < n \le 8$
  • C
    $4 \le n < 8$
  • D
    $4 < n < 8$

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