Assume that sequence x_n satisfies difference equation x_n=2x_{n-1)+delta_{n-2). Which of the below fuctions is the corresponding z-transform function? A X(Z) = 1/(1-2*z^{-1}-z~{-2}) B X(Z) = 1/(1-2*z^{-1}) C X(Z) = Z~{-2}/(1+2*21{-1}) D X(Z) = Z~{-2}/(1-2*21{-1})For polynomial equation Q(z)=1-z^{-1}-2z^{-2), we can write it as which of the following expression A (2-2) (2+1 ) B (2~{-1)-2) (2 {-1)+1) C (1-2z) (1+z) D (1-221{-1}) (1+z^{-1})