a) transverse displacement of one end of member relative to other end is not effectively prevented
b) longitudinal displacement of one end of member relative to other end is not effectively prevented

c) transverse displacement of one end of member relative to other end is effectively prevented
d) longitudinal displacement of one end of member relative to other end is effectively prevented

Answer: c
Explanation: In non-sway frame, transverse displacement of one end of member relative to other end is effectively prevented. Example : in triangulated frames and trusses, in plane stiffeners is provided by bracings or by shear walls, etc.