please help in Part A & B

A CFA is on a conference call with the CFO of an investment banking client. The call is on speaker and his door is open. As a result, salesman and traders overhear the CFO describing problems with material production target dates that have not been publicly disclosed. The salesmen relay this information to clients and have the traders reduce their positions in the stock. With respect to the Standard on material non-public information, the CFA has: violated the Standard by not making the information public when he realized others had overheard the call violated the Standard because he should have taken steps to prevent the dissemination of the information not violated the Standard because he has not acted on the information, but the salesmen and traders have violated the Standard John references his status as a "CFA candidate" in current client presentation materials. John completed the Level I CFA exam two years ago, reads research materials prepared by the CFA Institute, and continuing education for CFA charterholders. John plans to register for the Level Ill exam next year. John's reference to his status as a CFA candidate in presentation materials: does not violate the Standards violates the Standard on reference to the CFA Institute, the CFA Designation, and the CFA Program violates the Standard on conduct as a CFA Institute Member or CFA Candidate