What is the relationship between the effective slenderness ratio and the stability of a mechanical spring?

The effective slenderness ratio is given by λeff = αL0/D.
The absolute stability occurs when the term C�2/2eff in equation (10-10) is greater than one.
The absolute stability condition is given by L0 < πDα[2(E − G)/(2G + E)]1/2.
The value of the constant of the ends condition � depends on how the ends of the springs are supported.
a) I and II are correct.
b) II and III are correct.
c) II, III, and IV are correct.
d) I, III, and IV are correct.