Jaxon works as a senior accountant at Martinez Inc., a multinational technology giant. As a senior accountant at the company, Jaxon had exclusive access to some of the sensitive financial information of Martinez. It was later found that Jaxon had sold some of the sensitive information to a rival company for an undisclosed amount. Which of the following describes Jaxon's activity?

A. Underwriting

B. Limit order

C. Insider trading

D. Check clearing