Justifiable defense refers to a limited amount of acts against the offender in order to protect the country, the public interest, the person, property, and other rights of others or others from ongoing unlawful violations. According to the above definitions, Which of the following are legitimate defenses:. ["A holds a knife to robbing B's property, B fights back to take down A's knife, and stabs A's leg. A cannot move, and then B kills A with a knife.", 'A has threatened many times in public, wanting to kill B. After hearing B, he is both angry and scared, so he decides to start first and kill him when he is unprepared.', 'A is thinking about murdering B without suffering an excuse. When A sees B one day, he uses abusive methods to provoke B to seduce him first. After B starts, A takes out a prepared kitchen knife and kills B.', 'One night, Xiaohong was robbed. The robber held a dagger and threatened to kill if she did not hand over her money. Xiaohong had to surrender her wallet. When the robber bowed his head and counted the money, she picked up a brick and stunned. The robber then picked up his wallet and left the scene. It was later learned that the robber died because of ineffective rescue.']