Ann sued a grocery store for injuries. She had slipped on some accumulated rainwater as she stepped on a rubber mat just inside the door to the store....

Ann sued a grocery store for injuries. She had slipped on some accumulated rainwater as she stepped on a rubber mat just inside the door to the store. Prior to the fall, the bag boy had placed a “wet floor” sign approximately six feet directly in front of the door and had been instructed to mop the entrance area periodically in accordance with store procedure on rainy days. What defenses will the store assert?