Match the following:

	List I (Characteristic equation)		List II (Degree of damping)
A.	s2 + 15s + 56.25	1.	Undamped
B.	s2 + 5s + 6	2.	Underdamped
C.	s2 + 20.25	3.	Critically damped
D.	s2 + 4.55s + 42.25	4.	Overdamped