What are the hallmarks of a good business code of conduct? Are conflicts of interest the same as self-dealing?

What are the hallmarks of a good business code of conduct? Are conflicts of interest the same as self-dealing? (Explain your response.) What impact does tone at the top have on an organization's ethical culture? Is it possible for an accountant to be subject to more than one code of conduct at the same time? If so, how? Pick two provisions of the AICPA Code of Conduct and explain them and make a case that they are the two most important provisions.