In order to protect the country, the public interest, the person, property, and other legal rights of others or others from ongoing unlawful violations, actions taken to stop unlawful violations that cause damage to unlawful offenders are legitimate defenses and do not bear criminal responsibility. Liability: If the legitimate defense obviously exceeds the necessary limit and causes significant damage, it shall bear criminal liability, but the punishment shall be reduced or exempted. Based on the above definition, which of the following behaviors is typical of a legitimate defense? ['A dreams that B chases and kills himself. After waking up, he decides that B wants to kill himself and goes straight to B. Lieutenant General B.', 'A and B fought against each other. B saw that he was weak and ran away. A was desperate in the rear. B reluctantly picked up a stick and injured him when he was unstable.', 'Zhang practiced riding a motorcycle on the school playground and fell because of poor technology. Zhang Mou died after being rescued.', "One night, Liu met a gangster and robbed a woman's wallet, so Liu hurriedly picked up a brick and threw it over, and accidentally hit the woman's head, causing the woman's brain to be paralyzed."]