Which of the following is not a fourier transform pair?

• A. \(u(t) \leftrightarrow πδ(ω) + \frac{1}{jω}\)
• B. \(sgn(t) \leftrightarrow \frac{2}{jω}\)
• C. \(A \leftrightarrow 2πδ(\frac{ω}{2})\)
• D. \(G(t)\leftrightarrow sa(\frac{ωτ}{2})\)