901. Under Executive Order (E.O.) 13959, as amended, what level of due diligence must U.S. persons, including market intermediaries and other participants, undertake to assess whether an underlying purchase or sale is prohibited under E.O. 13959, as amended? 

For purposes of assessing whether certain purchases or sales are permissible under E.O. 13959, as amended, U.S. persons — including financial institutions, registered broker-dealers in securities, securities exchanges, and other market intermediaries and participants — may rely upon the information available to them in the ordinary course of business.