Under NASAA's Model Rule dealing with Unethical Business Practices of Investment Advisers, Investment Adviser Representatives, and Federal Covered Advisers, an investment adviser would have to disclose that the firm was acting in a principal capacity when A) the trade was being executed by an officer or partner of the firm B) shares held in the account of an advisory client are purchased by the investment adviser C) directing a securities transaction to an affiliated broker-dealer D) engaging in an agency cross transaction