Which or which of the following reflects the concept of credibility-objectivity according to the standards of the IMA code of ethics for management accountants?

a. refrain from communicating confidential information for illegal purposes

b.refrain from getting involved or supporting activities that may discredit the profession

c.maintain an appropriate professional level by following a continuing education program

d.disclose delays, deficiencies in information or in the internal control system as established by company policy or applicable regulations.