Sisse Brimberg, CFA, is responsible for performance presentations at her investment firm. The presentation that Sisse uses states that when making performance presentations her firm:

• deducts all fees and taxes;
• uses actual and simulated performance results; and
• bases the performance on a representative individual account.

Based only on this information, which of the following is the most appropriate recommendation to help Brimberg meet the CFA Institute Standards of Professional Conduct in her performance presentations? She should present performance based on: