According to NASAA's Statement of Policy on Unethical or Dishonest Business Practices of Broker-Dealers and Agents, all of the following practices are considered unethical for an agent EXCEPT A) selling 3,000 shares of ABC as directed by a client at a price that the agent determines, without oral or written discretionary authority B) selling 3,000 shares of ABC at a price the agent determines is the best the client can get, without oral or written discretionary authority C) determining the quantity of a specific security to purchase once the client has designated that security and the action to be taken D) receiving written discretionary authority from a client within 10 business days of first executing a discretionary trade with oral authority from the client