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The area of the cross-section of a road fully in banking shown in the given figure, is________________?

The area of the cross-section of a road fully in banking shown in the given figure, is________________?

A. [sb² + r² (2bd + sd)²]/(r² – s²)
B. [sb² + r² (2bd + sd)²]/(r² – s5)
C. [sb² + r² (2bd + sd)²]/(r – s)
D. None of these