Pick up the correct statement applicable to cased columns

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Pick up the correct statement applicable to cased columns.

A. Single I-beam or channels back with or without flange plates may be used

B. The overall dimensions of the steel section do not exceed 750 × 450 mm over plate if used

C. The column is unpainted and is solidly encased in ordinary dense concrete with 10 mm aggregates having a minimum of cube strength 160 kg/cm² at 28 days

D. The surface and edges of the steel column should be provided a concrete cover not less than 50 mm

E. All the above

Answer: Option E

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