Find the Z-transform of cos⁡ωn u(n).

• A. \(\frac{z(z+cos⁡ω)}{z^2-2z cos⁡ω+1}\)
• B. \(\frac{z(z-cos⁡ω)}{z^2-2z cos⁡ω+1}\)
• C. \(\frac{z(z-cos⁡ω)}{z^2+2z cos⁡ω+1}\)
• D. \(\frac{z(z+cos⁡ω)}{z^2+2z cos⁡ω+1}\)