Given below are a legal principle and a factual situation. Apply the given legal principle to the factual situation and select the most appropriate answer to the question given below:
Principle: Confession made in the court should be free and voluntary.
Facts: Sumeet wanted to give an expensive gift to his girlfriend on her birthday. But he did not have enough money. So he snatched a gold chain from an old lady. Police arrested Sumeet on suspicion and in the lock-up, the investigating officer told him that if he would admit his guilt he shall be set free. Sumeet confesses his guilt in the court.