If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is______________?

A. c[A + (m 1)ASC]

B. cAc + m cAsc

C. c(A Asc) + m cAsc

D. All the above

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