According to the Codes of Ethics for professional accountants, which of the following statements is an element of the principle of 'professional behaviour': a. Accountants must maintain professional knowledge and skill. b. Accountants must not compromise their professional judgement because of bias. c. Accountants must avoid any action that may bring discredit to the profession. d. Accountants must comply with relevant laws and regulations. o b only cand d Ob and d O b, c and d O a and c