Answer: C. Purlins
The roofing material in roof truss is supported over purlins.
Purlins is a structural member that acts as a beam in trusses. Roofing material is supported over the purlins in the roof truss.
A strut is a part of the roof truss which is used to bear the load. Struts are designed to take compressive loads.
Battens are used to provide fixing support for roof materials.
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