The the term independent in the expansion of `[(t^(-1)-1)x+(t^(-1)+1)^(-1)x^(-1)]^8` is

Options

A. `56((1-t)/(1+t))^(3)`
B. `56((1+t)/(1-t))^(3)`
C. `70((1-t)/(1+t))^(4)`
D. `70((1+t)/(1-t))^(4)`

Answer

C