单选题

What is the Fourier transform of the ...

Question

What is the Fourier transform of the signal x(n)=a|n|, |a|<1?

A. (1+a2)/(1-2acosω+a2)

B. (1-a2)/(1-2acosω+a2)

C. 2a/(1-2acosω+a2)

D. None of the mentioned