A casual system having the transfer function H(s) = 1/(s+2) is excited with 10 ∪(t). The time at which the output reaches 99% of its steady-state value is

A casual system having the transfer function H(s) = 1/(s+2) is excited

1.	A casual system having the transfer function H(s) = 1/(s+2) is excited with 10 ∪(t). The time at which the output reaches 99% of its steady-state value is
A.	2.7 sec
B.	2.5 sec
C.	2.3 sec
D.	2.1 sec
Answer» D. 2.1 sec