Write the given trigonometric function in terms of $\sec x$.
$\tan x$

• A. $\pm \sqrt{{\sec }^{2}x-1}$
• B. $\pm \sqrt{1-{\sec }^{2}x}$
• C. $\pm \sqrt{{\sec }^{2}x+1}$
• D. $\pm \sqrt{2{\sec }^{2}x-1}$

Answer: (A)