In a high-security facility there is searched the identity of a spy. It's known that the spy is one of the 3 new employees anyway : B , A , D.
They are together taken at an interview whose results are given bellow. The comitee who sustains the interview is able to find therefore the following things.
A. 1. I' m sure the spy is D. 2. The first statement of B is true anyway.
B. 1. I am not a spy. 2. The spy is A anyway.
D. 1.The second statement of A is true anyway. 2. But the second statement of B is false.
The investigation comitee only knows the spy made one true and one false statement but doesn't know anything about the truth of the other statements.
Who is the spy anyway ?