For purposes of this subsection, the term “person participating in an offering of penny stock” includes any person engaging in activities with a broker, dealer, or issuer for purposes of issuing, trading, or inducing or attempting to induce the purchase or sale of, any penny stock. The Commission may, by rule or regulation, define such term to include other activities, and may, by rule, regulation, or order, exempt any person or class of persons, in whole or in part, conditionally or unconditionally, from inclusion in such term.