In Slab-A:
Is this slab stable and what is the direction of main steel? How should that slab be considered (as a cantilever slab supported from long beam or as a slab supported on cantilever beams on either sides)?
In Slab-B:
Is this slab stable in the free corner region?
1) This does not look an engineered building. So there is not much point to discuss
2) Inspite of this if you want an answer, slab A is supported on 3 sides and you can replicate this in your analysis by plate analysis. If you want an easy conservative solution, design it as a cantilever if the span is less or design as 1 way in the long direction if that span is less. In both cases, there are likely redistribution cracks that depends on a variety of factors.It may not occur aswell. You can know about redistribution in the blog here. 3) Slab B is 2 side supported and this can also be replicated in analysis by shell modelling. If you want a conservative design, design as a cantilever.
You can learn these in the ETABS course here