49 Christina Tam, CFA, and Peter Wolf, CFA, are employed at Hamilton Investments. Tam develops an equity research model and uses it to issue a report on Iron Mining Corp. She also begins a report on Copper Core Inc. Shortly thereafter, Tam leaves the firm and Wolf uses Tam's model to issue a report on Zinc Drilling Ltd. without providing attribution to Tam. Wolf also finishes Tam's work on Copper Core and issues a report solely under his own name without providing attribution to Tam. Wolf later reissues Tam's report on Iron Mining, again solely under his own name.

Which of Wolf's actions violates the Standards?