Question 1: What requirements apply to the aircraft or vehicles peril? Question 2: What aspects of loss does the sprinkler leakage peril cover in addition to water damage to covered property? Question 3: How were property insurance policies modified in response to the concurrent causation doctrine? Question 4: Regarding commercial propenty insurance, in addition to the peris covered by the Causes of Loss-Basic Form, what are three perils that are covered by the Causes of Loss-Broad Form?