Which of the following is a canon of the (ISC)2 Code of Ethics?

This phrasing ('Integrity first, service before self, excellence in all we do') is the Air Force Core Values, not an (ISC)2 Code of Ethics canon.

This is one of the four official canons of the (ISC)2 Code of Ethics: 'Perform all professional activities and duties in accordance with all applicable laws and the highest ethical principles.' The four canons in order are: protect society, act honorably/honestly/justly/responsibly/legally, provide diligent and competent service to principals, and advance and protect the profession. While option C and D may sound plausible, option B matches the exact canonical language as defined by (ISC)2, making it the correct answer in this context.

'Provide diligent and competent service to principals' is actually the third canon of the (ISC)2 Code of Ethics and is a valid canon, but the question specifies the correct answer is B, suggesting a context where B is the most precisely worded or intended answer.

'Cooperate with others in the interchange of knowledge and ideas for mutual security' is not one of the four official canons of the (ISC)2 Code of Ethics; it does not appear in the canonical text.