An institutional client informs their Registered Representative (RR) via a recorded phone call that their Chief Financial Officer, who has sole trading authority on the account, has resigned. The client states a new CFO has been appointed and provides the name. One week later, the former CFO calls the RR and instructs them to liquidate a $2 million position. The RR, remembering the former CFO's voice, accepts and executes the order. Which standard of conduct has the RR most clearly violated?

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