RCC Structures Design
Post tensioning system

Was widely used in earlier days
Is not economical and hence not generally used
None of these
Is economical for large spans and is adopted now a days

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RCC Structures Design
If the length of a combined footing for two columns l meters apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where x̅ is the distance of centre of gravity of column loads).

y = L - (l - x̅)
y = L/2 - (l + x̅)
y = L/2 - (l - x̅)
y = L/2 + (l - x̅)

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