Equity markets involve:

• A permanent transfer of funds
• A temporary transfer of funds
• A predetermined return to investors
• Both B and D

The maintenance margin for a futures contract refers to:

• The level to which a margin deposit must be returned after a margin call has been made
• The level to which a margin deposit is set when an investor enters a long futures position
• The difference between the futures market price and the contract price
• The level of the margin deposit that would trigger a margin call