Solve this following

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{\sec ^{2} x}{\sqrt{16+\tan ^{2} x}} d x=?$

A. $\log \left|\tan x+\sqrt{\tan ^{2} x+16}\right|+C$

B. $\log \left|x+\sqrt{\tan ^{2} x+16}\right|+C$

C. $\log \left|\tan x-\sqrt{\tan ^{2} x+16}\right|+C$

D. none of these

Solution:

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