Futures traders must pay a certain percentage of the value of their futures contracts, usually (), for settlement and performance guarantee.

Answer: b

Futures trading should implement the margin system. In futures trading, the buyer and seller of futures must make delivery and performance guarantee according to a certain proportion (usually 5%- 15%) of the value of the futures contracts they buy and sell. Margin system is an important means of risk management in futures market. So option b is correct.

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