As a newly licensed Chartered Financial Analyst (CFA), you are presented with an opportunity to work with various clients. During your initial interactions, a client asks if you can recommend certain investments that are known to have unethical business practices associated with them. They believe that these investments will yield significant returns in the short term.
According to the CFA Institute Code of Ethics and Standards of Professional Conduct, how should you respond to this request in order to maintain professionalism?