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Que. 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 over loading
Answer:operator sub goaling
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