Which one of the following pairs is not correctly matched?
(a)Slenderness : The ratio of length of the column to the ratio least radius of gyration
(b) Bucking : The ratio of maximum load to the factor permissible axial load on the column
(c)Short column : A column for which slenderness ratio < 32
(d) Strut : A member of a structure in any position and carrying on axial compressive load