The Integral $\int \sec ^ { 2 } x d x$

Multiple Choice

The integral $\int \sec ^ { 2 } x d x$ is

A) $\tan x + x + C$
B) $\tan x - x + C$
C) $\tan x + \sec x + C$
D) $\tan x - \sec x + C$
E) $\tan x + C$