Given below are Legal Principles followed by a Factual Situation. Apply the principles followed by a factual Situation. Apply the principle to it and select the most appropriate answer for question among the four choices given.
LEGAL PRINCIPLE: Self-defence is considered as a universal exception for the internationally causing harm.
FACTUAL SITUATION: The robbers, armed with knives and crowbars, broke the access door of a house and entered into it. The owner of the house took out his gun and threatened to shoot them. The robbers ran out the house and started pelting stones. The owner opened the fire. Having heard the gun shot, the police rushed to the place and announced that the owner must stop firing. The owner, suspecting mischief, continued to fired and a policeman was injured by a shot. The robbers meanwhile fled away. The owner was sued for attacking the public servant on duty.