You sell a futures contract on a stock index when the futures price is $3,450. In one month, the futures price of the same contract is $3,200. Which of the following is correct?

	a.	You have lost $250 per unit of the index, and your account has been marked to market
	b.	You have lost $250 per unit of the index, but your account will not be settled until maturity
	c.	You have gained $250 per unit of the index, and your account has been marked to market
	d.	You have gained $250 per unit of the index, but your account will not be settled until maturity