Which of the Following Is/are True

Which of the following is/are true?

A) A derivative is a financial instrument whose value changes in response to changes in an underlying observable variable, such as a stock price, an interest rate, a currency exchange rate, or a commodity price.
B) Unlike equity securities, which have no definite settlement date, firms settle a derivative at a date that the terms of the instrument specify.
C) A derivative requires an investment that is small, relative to the investment in a contract that is similarly exposed to changes in market factors, or requires no investment at all.
D) Firms use derivative instruments to hedge the risks that arise from changes in interest rates, foreign exchange rates, and commodity prices.
E) all of the above