The unit step response of a particular control system is given by c(t) = 1 - 10e-t. Then its transfer function is:
A. $$\frac{{10}}{{s + 1}}$$
B. $$\frac{{s - 9}}{{s + 1}}$$
C. $$\frac{{1 - 9s}}{{s + 1}}$$
D. $$\frac{{1 - 9s}}{{s\left( {s + 1} \right)}}$$
Answer: Option C

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