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Marty Brown is a sales representative for CloudKeepers Data Storage, and his territory includes Washington, D.C., and the surrounding area. Rebecca Davies, the CEO of Tiger PR Agency, is in the market for a data storage system that can help her run her growing business efficiently. Rebecca has budgeted $10,000 for a PowerVault ME5012 storage system; however, Marty informs her that the PowerVault ME5012 costs $15,000. After negotiating, Marty and Rebecca agree that Rebecca will provide $15,000 of PR services to CloudKeepers in exchange for the PowerVault ME5012. Which of the following did Marty and Rebecca successfully utilize to facilitate this business transaction?