Which of the following statements is true? O a. A swap contract is an agreement between two or more partios to purchase or sell a certain commodity or financial asset at a future date and at a definite price. O b.A future contract grants a party the right, not the obligation, to execute a transaction at a specific price on or before the settioment date OC An option contract is an agreement between two or more parties to exchange fulure cash flows to hedge interest rate and foreign currency risks O d.A derivative is a financial instrument whose value is derived from the value of another asset, class of assets, or economic variable.