Xin is a recent college graduate who is interning with a hedge fund. He is excited to be working in finance and is willing to work long hours to impress his coworkers in the hopes that they will hire him as a full$-$time employee. One of his colleagues asks Xin if he can make copies of a document. While he is making the copies, Xin notices that the document includes material nonpublic information from another company. He knows from his studies that it would be illegal to make investment decisions based on this information. Xin is not sure how to handle this situation, so he references the company handbook, which includes standards of conduct, also known as $\_\_\_\_\_\_\_\_\_\_\_.$

a code of ethics

a universal ethical standard

business ethics

an ethical dilemma