An investment adviser representative (IAR) at a federally covered investment adviser firm is preparing a new advertising campaign. According to the SEC's Marketing Rule (Rule 206(4)-1), which of the following practices is explicitly prohibited?
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A
Including a testimonial from a current client who is being compensated.
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B
Presenting gross performance data without also presenting net performance data.
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C
Using a third-party rating in an advertisement with proper disclosures.
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D
Discussing the firm's investment philosophy in a live, extemporaneous radio interview.