If $\sec 4\theta - \sec 2\theta = 2$, then the general value of $\theta $ is

  • [IIT 1963]
  • A

    $(2n + 1)\frac{\pi }{4}$

  • B

    $(2n + 1)\frac{\pi }{{10}}$

  • C

    $n\pi + \frac{\pi }{2}$or $\frac{{n\pi }}{5} + \frac{\pi }{{10}}$

  • D

    None of these

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  • [IIT 1992]