Number of state variables of discrete time system, described by $$y\left[ n \right] - \frac{3}{4}y\left[ {n - 1} \right] + \frac{1}{8}y\left[ {n - 2} \right] = x\left[ n \right]$$ is
A. 2
B. 3
C. 4
D. 1
Answer: Option A
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