What is \(\rm \int \frac{dx}{\sec x+\tan x}\) equal to?

• A. ln (sec x) + ln |sec x + tan x| + c
• B. ln (sec x) - ln |sec x + tan x| + c
• C. sec x tan x - ln |sec x - tan x| + c
• D. ln |sec x + tan x| - ln |sec x| + c