A digital filter is described by the following difference equation. determine if this is an IIR or FIR filter. Explain your answer.
Y[n] = 0.25x[n] + 0.5x[n-1] + 0.25x[n-2] - 1.2y[n-1] + 0.2y[n-2]
Y[n] = 0.25x[n] + 0.5x[n-1] + 0.25x[n-2] - 1.2y[n-1] + 0.2y[n-2]