The characteristic equation of a linear time-invariant (LTI) system is given by Δ(s) = s4 + 3s3 + 3s2 + s + k = 0. The system is BIBO stable if

The characteristic equation of a linear time-invariant (LTI) system is

1.	The characteristic equation of a linear time-invariant (LTI) system is given by Δ(s) = s4 + 3s3 + 3s2 + s + k = 0. The system is BIBO stable if
A.	\(0 < k < \frac{{12}}{9}\)
B.	k > 3
C.	\(0 < k < \frac{8}{9}\)
D.	k > 6
Answer» D. k > 6