To recover for a slip-and-fall, a plaintiff must prove that the defendant was negligent. A defendant is negligent in the use or maintenance of property in California if: 1) A condition on the property created an unreasonable risk of harm; 2) The defendant knew or, through the exercise of reasonable care, should have known about it; and 3) The defendant failed to repair the condition, protect against harm from the condition, or give adequate warning of the condition.