Answer: D. All of the above.
The construction joints are provided for all the given options.
Construction joints are formed when new concrete section is poured next to the old previously-set section. The position of these joints is decided prior to the concreting. The construction joints are provided at the position where bending moment and shear force is small. Also, it is preferred to provide these joints where the member is being supported by another member.
Hence, the construction joints are provided where B.M is small, S.F is small, and where the member is supported by another member.
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