In terms of ξ and ωn the settling time of a second order systems for 2% criterion and step input is equal to

In terms of ξ and ωn the settling time of a second order systems for

1.	In terms of ξ and ωn the settling time of a second order systems for 2% criterion and step input is equal to
A.	1/ξωn
B.	2/ξωn
C.	3/ξωn
D.	4/ξωn
Answer» E.