The unit-step response of a system is given by c(t) = 4 + 3t – 4e–t
The system has the following poles and zeros
1
one pole at origin, one pole at – 1, and one zero at \( - \frac{3}{7}\)
2
one pole at the origin, one pole at \( - \frac{3}{7}\)and one zero at – 1
3
one zero at – 4, two poles at\( - \frac{3}{7}\) and 4
4
One zero at 4, two poles at \( - \frac{3}{7}\) and 4