In a beam the local bond stress Sb, is equal to_______________?

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In a beam the local bond stress Sb, is equal to_______________?

A. Shear force/(Leaver arm × Total perimeter of reinforcement)(Correct)
B. Total perimeter of reinforcement/(Leaver arm × Shear force)
C. Leaver arm/(Shear force × Total perimeter of reinforcement)
D. Leaver arm/(Bending moment × Total perimeter of reinforcement)