The Commission may not, under this section, exempt any person, security, or transaction, or any class or classes of persons, securities, or transactions from section
78o–5 of this title or the rules or regulations issued thereunder or (for purposes of section
78o–5 of this title and the rules and regulations issued thereunder) from any definition in paragraph (42), (43), (44), or (45) of section
78c
(a) of this title.