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Answer: Option 4
Justified : having, done for, or marked by a good or legitimate reason. Futile : incapable of producing any useful result; pointless. Efficient : (of a system or machine) achieving maximum productivity with minimum wasted effort or expense. Productive : producing or able to produce large amounts of goods, crops, or other commodities. Fruitful : producing good or helpful results; productive. Synonym of Fruitful is Productive
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