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According to Indian standard specifications, SG 400/15 means

A. Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

B. Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

C. Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

D. None of the above

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