Define the following terms related to futures contracts: a. Futures price-the amount that the buyer of a futures contract agrees to pay for the underlying assets for a certain period of time. B. settlement price-the value represented by the last few minutes of the last day of the contract transaction. Spot price-the current price of assets marked on the spot market. D. Reverse transactions-transactions that can make the net position of futures contracts zero. For those who hold long futures, reverse trading means holding some same futures selling contracts. For those who hold short futures, reverse trading is a buyer's contract that holds some of the same futures. E. Mark the market day by day-the act of calculating the contract price every day according to the current market price. The difference between the futures price and the spot price.