Employees at a pharmaceutical company make large profits by buying shares of the firm when the trials of a drug begin but before the results are announced. Which form of the efficient market hypothesis does this contradict?

		Weak form
		Semi-strong form
		Strong form
		Weak and semi-strong form
		Weak, semi-strong, and strong form

This seems like an example of strong form market efficiency but the question is throwing me off because it asks which form does it CONTRADICT. Please help me understand the question and concept