ATPL: From the following list:1. Fuel jettisoning system and its operation are free from fire hazard2. The fuel discharges clear of any part of the aeroplane3. Fuel fumes do not enter any part of the aeroplane4. The jettisoning operation does not adversely affect the controllability of the aeroplane.Which of the above are requirements that must be shown to exist during fuel jettisoning tests: