Hàm truyền nào sau đây là của hệ thống rời rạc

\(G\left. z \right.=\frac{C(z)}{R(z)}=\frac{{z}^{-(n-m)}[{b}_{0}+{b}_{1}{z}^{-1}+…+{b}_{m-1}{z}^{-m+1}+{b}_{m}{z}^{-m}}{{a}_{0}+{a}_{1}{z}^{-1}+…+{a}_{n-1}{z}^{-n+1}+{a}_{n}{z}^{-n}}\)

\(G\left. z \right.=\frac{C(z)}{R(z)}=\frac{{z}^{-(n-m)}[{b}_{0}+{b}_{1}{z}^{-1}+…+{b}_{m-1}{z}^{-m+1}+{b}_{m}{z}^{-m}}{{a}_{0}-{a}_{1}{z}^{-1}-…-{a}_{n-1}{z}^{-n+1}-{a}_{n}{z}^{-n}}\)

\(G\left. z \right.=\frac{C(z)}{R(z)}=\frac{{z}^{-(n-m)}[{b}_{0}-{b}_{1}{z}^{-1}-…-{b}_{m-1}{z}^{-m+1}-{b}_{m}{z}^{-m}}{{a}_{0}-{a}_{1}{z}^{-1}-…-{a}_{n-1}{z}^{-n+1}-{a}_{n}{z}^{-n}}\)

\(G\left. z \right.=\frac{C(z)}{R(z)}=\frac{{z}^{-(n-m)}[{b}_{0}-{b}_{1}{z}^{-1}-…-{b}_{m-1}{z}^{-m+1}-{b}_{m}{z}^{-m}}{{a}_{0}+{a}_{1}{z}^{-1}+…+{a}_{n-1}{z}^{-n+1}+{a}_{n}{z}^{-n}}\)