What is the magnitude of the frequency response of the system described by the difference equation y(n)=ay(n-1)+bx(n), 0

• A. \(\frac{|b|}{\sqrt{1+2acosω+a^2}}\)
• B. \(\frac{|b|}{1-2acosω+a^2}\)
• C. \(\frac{|b|}{1+2acosω+a^2}\)
• D. \(\frac{|b|}{\sqrt{1-2acosω+a^2}}\)