If $A_{c}$ , $A_{s c}$ and A ae areas of concrete, longitudinal steel and section of a R.C.C. column and m and $σ_{c}$ are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

- 1
  
  $σ_{c} A_{c} + m σ_{c} A_{s c}$
- 2
  
  $σ_{c} (A - A_{s c}) + m σ_{c} A_{s c}$
- 3
  
  $σ_{c} [A + (m - 1) A_{s c}]$
- 4
  
  all the above

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