RCC Structures Design
A pre-stressed concrete member is preferred because

Its dimensions are not decided from the diagonal tensile stress
All listed here
Large size of long beams carrying large shear force need not be adopted
Removal of cracks in the members due to shrinkage

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RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
(Area of the column A × Safe punching stress)/Load on column A
None of these
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)

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