Final answer:
A professional of integrity is best described as someone who adheres to a strong code of ethics, aligning their actions with moral principles that guide behavior beyond mere legal compliance.
Step-by-step explanation:
The best description for what it means to be a professional of integrity is b) Adhering to a strong code of ethics. Being a professional of integrity involves more than just following laws and regulations; it encompasses a commitment to ethical principles that guide one's behavior in a variety of situations. This can include taking actions that are not just legally permissible but also morally commendable, even if they do not directly benefit one personally. Moreover, such commitment often ties back to broader moral theories and political debate, and can be seen within the context of institutional expectations, as in the case of the IEEE-CS's Software Engineering Code of Ethics and Professional Practice.