According to the Standard concerning suitability, it is most likely that members and candidates in advisory relationships with clients should:

Members and candidates who are in advisory relationships with clients should document unsuccessful attempts to update client information and circumstances. Because risk is to be evaluated in a portfolio context, there is no prohibition against the purchase of a security that is risky on a stand-alone basis, as long as the risk of the clients overall portfolio is consistent with their ability and willingness to assume investment risk. While lack of client information could make suitability a difficult question, Standard III(C) Suitability does not prohibit managing assets for clients who withhold information about their financial circumstances and needs.