In which category do commodities belong?

long-term investment only

short-term investment only

either short - or long-term investment

neither short - nor long-term investment

The best answer for this question would be:

either short - or long-term investment

The investment of commodities involves that an investor will buy stocks or mutual funds in exchange of traded funds. It usually involves a future contract that would be signed, the investments could be productions, foreign currencies or company stocks.