Commercial paper consists of short-term, unsecured promissory notes issued by large, creditworthy corporations to finance short-term needs like accounts receivable and inventory. It is a money market security, meaning it has a maturity of less than one year (typically 1 to 270 days). Because it is unsecured, it is primarily issued by firms with high credit ratings. The notes are sold at a discount to face value, and the return to the investor is the difference between the purchase price and the face value received at maturity.

B. risk-based factors: These are variables used in asset pricing models to explain returns, not a type of debt instrument.

C. risk premiums: This is the additional return an investor demands for taking on higher risk, not a security itself.

D. unrealistic bonds: This is not a recognized term or classification for any financial instrument in the corporate finance domain.

1. Mishkin, F. S., & Eakins, S. G. (2018). Financial Markets and Institutions (9th ed.). Pearson. In Chapter 11, "The Money Markets," commercial paper is defined as "unsecured short-term debt instrument issued by a corporation" (p. 268).

2. Ross, S. A., Westerfield, R. W., & Jaffe, J. (2019). Corporate Finance (12th ed.). McGraw-Hill Education. Chapter 28, "Short-Term Finance and Planning," describes commercial paper as "short-term, unsecured notes issued by large and highly rated firms" (p. 851).

3. Gorton, G. (2010). Slapped by the Invisible Hand: The Panic of 2007. Oxford University Press. In Chapter 4, "The New Banking System," commercial paper is described as a form of short-term, unsecured debt: "Commercial paper is a promissory note—an IOU—issued by a nonfinancial or financial firm" (p. 56).

4. Kacperczyk, M., & Schnabl, P. (2010). When Safe Proved Risky: Commercial Paper during the Financial Crisis of 2007–2009. Journal of Economic Perspectives, 24(1), 29-50. The article's introduction defines commercial paper as "a short-term, unsecured debt instrument issued by corporations" (p. 29). DOI: https://doi.org/10.1257/jep.24.1.29