For continuous-time system, state variable representation is $$\frac{{\text{d}}}{{{\text{dt}}}}$$ q(t) = Aq(t) + bx(t)
What is the corresponding representation for discrete-time system?
A. $$\frac{{\text{d}}}{{{\text{dt}}}}$$ q[n] = Aq[n] + bx[n]
B. q[n + 1] = Aq[n] + bx[n]
C. q[n] = Aq[n - 1] + bx[n]
D. $$\frac{{\text{d}}}{{{\text{dn}}}}$$ [q(n + 1)] = Aq[n - 1] + bx[n - 1]
Answer: Option B

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