What type of market involves the buying and selling of securities among investors?

The secondary market is the correct answer because it is specifically designed for the buying and selling of securities among investors after they have been issued in the primary market. In this market, investors trade securities with one another, which provides liquidity and allows for price discovery of the securities based on supply and demand dynamics.

In contrast, the primary market is where new securities are created and sold for the first time, typically through initial public offerings (IPOs). The commodities market involves the trading of physical goods like oil and gold, while the derivative market deals with financial instruments whose value is derived from other underlying assets. These markets serve different functions compared to the secondary market, where the focus is on reselling already issued securities.