It's a rainy day, and as you enter your favorite Wal-Mart store, you notice there's a puddle of water on the floor. There's a warning sign, but the puddle of water is pretty deep. You step in it, and to your surprise, slip and fall. Luckily, you're not hurt, just really embarrassed. Can Wal-Mart be held liable for negligence in this case? Discuss all 4 elements of negligence, and the defenses to a claim of negligence, in your answer.