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A realization of a stable discrete time system is shown in the figure. If the system is excited by a unit step sequence input $x[n ],$ the response $y[n ]$ is

1. $4\left(-\dfrac{1}{3}\right)^{n}\:u[n]-5\left(-\dfrac{2}{3}\right)^{n}\:u[n]$
2. $5\left(-\dfrac{2}{3}\right)^{n}\:u[n]-3\left(-\dfrac{1}{3}\right)^{n}\:u[n]$
3. $5\left(\dfrac{1}{3}\right)^{n}\:u[n]-5\left(\dfrac{2}{3}\right)^{n}\:u[n]$
4. $5\left(\dfrac{2}{3}\right)^{n}\:u[n]-5\left(\dfrac{1}{3}\right)^{n}\:u[n]$