Rationale justifying Ethical Relativism

1-) What are some of the advantages and disadvantages of ethical egoism as an ethical philosophy for business managers?

2-) What exactly is “Machiavellian ethics,” and how could it be applied to business management and entrepreneurship? Must Machiavellian ethics be applied in order to achieve success in business today?
3-)5. What are some of the advantages and disadvantages of ethical relativism as an ethical philosophy for business managers? Do you agree with the basic “relativism” rationale justifying ethical relativism?