Legal Principle: Performance of a legal duty cannot be a consideration for a promiseFactual Situation: A's wallet is stolen by a thief. A lodges a complaint in the police station and A promises to pay a sum of ` 500 to the person who is able to apprehend the thief and get back his wallet. The policeman's servant X apprehends the thief and gets back the wallet. A refuses to pay X the promised '500. Choose the correct option: I. The servant is entitled to the reward. II. The policeman would have been entitled to the reward had he been the person to apprehend the thief. III. The policeman would be entitled to the reward even if he had not apprehended the thief. IV. The servant would not be entitled to the reward. (SET LAW 2012)

Each question consists of legal principle(s) (hereinafter referred to as 'principle') and facts. Such proposition may or may not be true in the real and legal sense, yet you have to conclusively assume them to be true for the purposes of this section. You have to apply the principles to the given facts to arrive at the most reasonable conclusion. Only one of the alternatives, i.e., (A), (B), (C), or (D) is the most reasonable conclusion. Remember: you must not rely on any principle except the principles that are given for every question.