Find the Integral Using the Indicated Substitution $$\int ( 4 x + 3 ) ^ { 6 } d x , \quad u = 4 x + 3$$

Multiple Choice

Find the integral using the indicated substitution.
$$\int ( 4 x + 3 ) ^ { 6 } d x , \quad u = 4 x + 3$$ Select the correct answer.

A) $\frac { 1 } { 28 } ( 4 x + 3 ) ^ { 7 } + C$
B) $6 ( 4 x + 3 ) ^ { 7 } + C$
C) $\frac { 1 } { 6 } ( 4 x + 3 ) ^ { 2 } + C$
D) $\frac { 1 } { 7 } ( 4 x + 3 ) ^ { 2 } + C$