Answer:
The customer could buy call options and sell put options.
Explanation:
A call option gives you the right to buy a stock at a certain price. If the price of a stock rises (as the investor believes), the call option can be exercised and a profit will be made.
A put option gives you gives you the right to sell at a certain price. If the price of a stock rises (as the investor believes), the put option will not be exercised since the sales price will be lower than the market price.
