The mean-end analysis process centers
around the detection of differences between the current state and goal state. Once such a difference
is isolated, an operator that can reduce the difference must be found. But perhaps that operator can
not be applied to the current state. So a sub-problem of getting to a state in which it can be applied is set up.
The kind of backward chaining in which operators are selected and then sub goals are set up to establish the precondition
of operators is called
(A) backward planning
(B) goal stack planning
(C) operator sub goaling
(D) operator overloading.
Answer c.
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