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As per IRC recommendations, the sub-grade or sub-base layer whatever underlies the concrete wearing slab, in concrete pavements, must confirm to the requirement that

[A].	no soft spots are present in the sub-grade or sub-base	[B].	the base or sub-base extends to atleast 30 cm wider on either side of the width to be concreted
[C].	the sub-grade is properly drained	[D].	all of the above

Answer: Option D

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