A forward contract is a derivative instrument whose value is derived from the value of an underlying asset, such as commodities, currencies, or financial instruments. It is a customized agreement between two parties to buy or sell an asset at a future date at a specified price.

Why Other Options are Incorrect:

A . Real estate investment trust: A REIT is an equity instrument tied to real estate assets, not a derivative.

C . Preferred share: A preferred share is an equity security with fixed dividends, not a derivative.

D . Inflation-linked bond: These are fixed-income securities linked to inflation rates but are not considered derivatives.

Reference: CSC Volume 1, Chapter 10, 'The Role of Derivatives -- Forward Contracts' describes forwards as derivatives dependent on underlying assets.