I'm just getting started with no till
gardening myself and I'd probably have to go with A or B. I'm assuming you are wanting the clover and radish to grow
enough to provide some green manure and help break up the soil. Im not sure what your zone is, but here in 5b, I'd probably wait until after the first killing frost and start putting the cardboard down in the fall.
Like I said I'm just getting started too, so will be following along to see what others recommend as well.