Which of the following best defines the term 'risk' in the context of arboricultural hazard assessment?
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A
The potential for a tree or tree part to cause harm.
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B
The combination of the likelihood of a tree failure occurring and the severity of the potential consequences.
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C
Any structural defect, decay, or condition that may lead to tree failure.
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D
A tree that has been identified for removal due to its condition.