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In the calculation of induced shear stress in helical springs, the Wahl's correction factor is used to take care of:

A) Combined effect of transverse shear stress and bending stress in the wire.

B) Combined effect of bending stress and curvature of the wire.

C) Combined effect of transverse shear stress and curvature of the wire.

D) Combined effect of torsional shear stress an transverse shear stress in the wire