Which of the following is a common problem with ill-defined problems?
A) They cannot be solved by algorithmic approaches.
B) They cannot be solved by using operators.
C) It can be difficult to know when the solution has been reached.
D) They cannot be solved by heuristic approaches.
Answer: C
Rationale: An ill-defined problem is a problem that may be lacking definition in one or more ways, such as an ambiguous initial state or a lack of familiar operators. Because they often have unclear or ambiguous goal states, it can be difficult to know when the problem has been solved.
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