In futures markets a trader:

Select one:

a. Usually represents hedge funds and trying to implement sophisticated strategies to earn abnormal returns

b. can represent a superannuation fund and buys VIX futures anticipating high volatility in coming months

c. can be a funds manager and tries to realise risk-free returns taking advantage of price differentials between different markets

d. can buy and sell futures contracts multiple times during the day adding depth and liquidity to the markets