In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on__________________?

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In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on__________________?

A. horizontal plane only
B. vertical plane only
C. both horizontal and vertical planes
D. all planes except horizontal and vertical planes