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

The Base Or Sub-Base Extends Atleast 30 Cm Wider On Either Side Of The Width To Be Concreted

No Soft Spots Are Present In The Sub-Grade Or Sub-Base

The Sub-Grade Is Properly Drained

All Of The Above