x [n] = (0.3) ^ n u [n] + (0.5) ^ n u [n] is a discrete time signal

Which of the following is the convergence region of this signal?

The z transformation of the discrete time signal X (z) = z (z-0.2) / (z ^ 2-1.6z + 0.6) where (z ^ 2-1.6z + 0.6) = (z-0.6) (z-1) Which of the following is the inverse z transform of this signal?

  

O a. Izl 0.3 O d. Izl>0.5 O e. Izl