What is futures? What are options? What is a forward transaction? What is the difference? Please give an example.
Futures are 3 yuan 1 ton/meter after the meeting of Party A and Party B 1 year. The option is that Party C "has the right" to buy 1 ton of rice from Party D with 3 yuan after 1 year. After 1 year, Party A must buy, and Party C may not buy 1 ton of rice. Forward transactions are not paid in advance, but delivered in advance, and futures options are all. The word limit can only be answered briefly.