The purlins in roof trusses are placed at the panel points essentially to avoid
(a) Axial force in rafter (b) Shear force in rafter
(c ) Deflection in rafter (d) Bending moment in rafter
(a) Axial force in rafter (b) Shear force in rafter
(c ) Deflection in rafter (d) Bending moment in rafter