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

• A. ( frac{1+a^2}{1-2acos +a^2} )
• B. ( frac{1-a^2}{1-2acos +a^2} )
• C. ( frac{2a}{1-2acos +a^2} )
• D. None of the mentioned