Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Shear stress is a type of normal stress that acts in a direction perpendicular to the cut surface of any object.
Reason (R) : Shear stress is the one that acts parallel or tangential to the surface.
In the light of the above statements, choose the most appropriate answer from the options given below :