If A=\(\frac{-Ω_1^2+Ω_u Ω_l}{Ω_1 (Ω_u-Ω_l)}\) and B=\(\frac{Ω_2^2-Ω_u Ω_l}{Ω_2 (Ω_u-Ω_l)}\), then which of the following is the backward design equation for a low pass-to-band pass transformation?

• A. ΩS=|B|
• B. ΩS=|A|
• C. ΩS=Max{|A|,|B|}
• D. ΩS=Min{|A|,|B|}