9. Consider the Horn KBs: SpeakChinese(FatherOf (x)) SpeakChinese (x) LivelnTaiwan (x) SpeakChinese (x) SpeakChinese (Li) LlvelnTaiwan( Su) Where x is variable, Li, Su are constants, and FatherOf is a function. Suppose we use a "breadth-first" forward chaining algorithm, repeatedly adds consquences of current satisfied rules, and we use a "depth-first" backward chaining algorithm that tries clauses in the order as the sentences list above about the KB. Which of the following statement(s) is true? The forward chaining will infer the result SpeakChinese(Su) Given the query SpeakChinese(Su), The backward chaining will loop forever The forward chaining will infer the result LivelnTaiwan(Li) If the forward chaining can not infer a query, it does not mean it can not be intailed by the KB If the backward chaining does not return True for a given query, then it is not entailed by the KB