$\int \sec^4 x \tan x \; dx = $

  • A
    $\frac{1}{4} \sec^4 x + c$
  • B
    $4 \sec^4 x + c$
  • C
    $\frac{\sec^3 x}{3} + c$
  • D
    $3 \sec^3 x + c$

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