Potts, a building contractor, sued Dennis for failure to pay on a small cost-plus construction 84 contract. At trial, Potts, who personally supervised all of the work, seeks to testify to what he remembers about the amount of pipe used, the number of workers used on the job, and the number of hours spent grading. Dennis objects on the ground that Potts had routinely recorded these facts in notebooks which are in Potts' possession. Potts' testimony is
admissible as a report of regularly conducted business activity. admissible as based on first-hand knowledge. inadmissible, because it violates the best evidence rule.  inadmissible, because a summary of writings cannot be made unless the originals are available for examination