Which procedure must be performed before takeoff if there is ice on the wings?

The correct procedure for addressing ice on the wings before takeoff is to activate anti-ice procedures. This is essential for ensuring the aircraft maintains optimal aerodynamic performance and control. Ice accumulation on the wings can significantly disrupt airflow, leading to stall conditions and potential handling issues during takeoff.

Anti-ice procedures typically involve applying heat to critical surfaces such as the wings and tail, or using chemical de-icers to remove existing ice. This is crucial for safety, as ice can lead to increased drag and reduced lift, thereby compromising the aircraft's ability to take off safely.

The other options do not align with safety protocols in aviation. Taking off without addressing ice is dangerous and counter to established guidelines, while waiting until landing does not address the immediate need for safe takeoff conditions. Similarly, dismissing the requirement for any procedures ignores the risk that ice poses to flight safety. Hence, activating anti-ice procedures is the necessary and correct action when ice is present on the wings.