The slenderness ratio is the ratio of
(a) Length of column to least radius of gyration
(b) Moment of inertia to area of cross-section
(c) Area of cross-section to moment of inertia
(d) Least radius of gyration to length of the column
(a) Length of column to least radius of gyration
(b) Moment of inertia to area of cross-section
(c) Area of cross-section to moment of inertia
(d) Least radius of gyration to length of the column