What cloud clearance is required for operating under basic VFR in Class D airspace?

For operating under basic Visual Flight Rules (VFR) in Class D airspace, the requirement is to remain clear of clouds. This means that pilots must ensure they have a clear view of the sky without obstructions from cloud cover to maintain visual reference and avoid potential collisions with other aircraft.

This requirement facilitates safe navigation and operational integrity by ensuring pilots can visually perceive other aircraft and significant ground references. Being clear of clouds helps reduce the risk of losing visual contact with the ground or other aircraft, which is crucial for maintaining safety during flight.

The other options incorrectly entail specified distances from cloud cover, which do not align with the basic VFR requirements in Class D airspace specifically, where the emphasis is on being visually clear of any clouds.