Which action indicates possible Penza scheme activity?

A Penza scheme, also known as a Ponzi scheme, is a form of fraud that lures investors and pays profits to earlier investors with funds from more recent investors1 The scheme relies on attracting new investors with unrealistic promises of high returns and low risk, while using their money to pay off the previous investors2 An unlicensed investment advisor who offers profits other investments cannot guarantee is likely to be involved in a Penza scheme, as this is a common way to entice unsuspecting victims3 The other options are not necessarily indicative of a Penza scheme, as they could be legitimate or involve other types of fraud.

 1 Ponzi scheme - Wikipedia; 2 Ponzi Schemes: Definition, Examples, and Origins - Investopedia; 3 What is Ponzi Scheme? - Sanction Scanner