f(x)=(x-1)/(x+1)的反函数是()

f(x)=(x-1)/(x+1)的反函数是()
A、f-1(x)=(x-1)/(x+1)
B、f-1(x)=(1-x)/(1+x)
C、f-1(x)=(x+1)/(x-1)
D、f-1(x)=(1+x)/(1-x)
【正确答案】：D