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Which of the following options is true for a linear time-invariant discrete time system that obeys the difference equation:

$$y\left [ n \right ]-ay\left [ n-1 \right ]=b_{0}x\left [ n \right ]-b_{1}x\left [ n-1 \right ]$$

  1. $y[n]$ is unaffected by the values of $x\left [ n-k \right ];k>2.$
  2. The system is necessarily causal.
  3. The system impulse response is non-zero at infinitely many instants.
  4. When $x\left [ n \right ]=0,n < 0$, the function $y\left [ n \right];n > 0$ is solely determined by the function $x[n]$.
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