Find the Integral Using the Indicated Substitution $$\int \tan ^ { 2 } x \sec ^ { 2 } x d x , \quad u = \tan x$$

Multiple Choice

Find the integral using the indicated substitution.
$$\int \tan ^ { 2 } x \sec ^ { 2 } x d x , \quad u = \tan x$$
Select the correct answer.

A) $\frac { 1 } { 8 } \tan ^ { 8 } x \sec ^ { 2 } x + C$
B) $\frac { 1 } { 8 } \tan ^ { 8 } x \sec ^ { 3 } x + C$
C) $\frac { 1 } { 24 } \tan ^ { 8 } x \sec ^ { 3 } x + C$
D) $\frac { 1 } { 8 } \tan ^ { 8 } x + C$