Answer: OPTION D
Explanation:
A. Public information can be defined as the information the dissemination of which would not threaten the security.
B. The stock repurchased by the company leading to reduction in outstanding stock is called treasury stock.
C. Faulty information as the name says is the information that is not true.
D. Insider trading information is the information that is not made available to public yet and can influence the decision of the investor.
Hence we can conclude that Tara worked on insider information.