The response c(t) of a system is described by the differential equation $$\frac{{{d^2}c\left( t \right)}}{{d{t^2}}} + 4\frac{{dc\left( t \right)}}{{dt}} + 5c\left( t \right) = 0$$
The system response is:
A. undamped
B. under damped
C. critically damped
D. oscillatory
Answer: Option B
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