Consider the following statements:Secondary stresses are induced in a roof truss due to1. Purlins placed at intermediate points on panel lengths.2. Rigidity of joints.3. Eccentricity of the bolt line relative to the centroid of the member.Which of the above statements are correct?

Consider the following statements:Secondary stresses are induced in a

1.	Consider the following statements:Secondary stresses are induced in a roof truss due to1. Purlins placed at intermediate points on panel lengths.2. Rigidity of joints.3. Eccentricity of the bolt line relative to the centroid of the member.Which of the above statements are correct?
A.	1 and 2 only
B.	1 and 3 only
C.	2 and 3 only
D.	1, 2 and 3
Answer» E.