Evaluate the integral: ∫ 8tan^4(x)sec^6(x)dx. What is the value of the constant of integration?
A) 8tan^5(x)sec^5(x) + C
B) 8tan^5(x)sec^7(x) + C
C) 8tan³(x)sec^5(x) + C
D) 8tan³(x)sec^7(x) + C