Discussion
What does it mean that propagation reaches a unique fixed point?
Answer: B
Because each propagator only removes values that no solution could use, the final domains are the same whatever order the propagators run in, which means the implementation is free to schedule them for efficiency. Solution counts, singleton domains and prescribed orders are different matters. Confluence of a rewriting process, meaning the order does not affect the result, is what allows the scheduling to be treated purely as an optimisation.
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