Discussion
Why is the order of assignment irrelevant to the set of solutions?
Answer: B
Since a solution is an assignment of values to all variables, the order in which they were assigned does not appear in it, so the search tree can be pruned to consider only one ordering at each level. That reduces the tree from n factorial times d to the n down to d to the n. Constraint checking happens throughout, orderings give different trees, and variables are central. Recognising a symmetry and refusing to search its equivalent branches is one of the largest available savings.
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