Why do professions have a code of ethics?

a$.$ The code of ethics helps to identify the most credible sources of truth for that profession.

b$.$ The code of ethics outlines what is right or acceptable in a particular society, so that the profession can align itself to these standards.

c$.$ The code of ethics outlines the laws that apply to this profession. Failing to adhere to the code could lead to lawsuits or criminal charges.

d$.$ To help members make choices that follow the established values and practices of the profession.