Which air traffic control requirement is part of Class E airspace?

In Class E airspace, the requirements for communication with air traffic control (ATC) depend primarily on the visibility and cloud clearance requirements for VFR (Visual Flight Rules) flight. If a pilot is operating under VFR conditions, there are no specific ATC communication requirements, meaning pilots can operate freely without needing to communicate with ATC directly. This characteristic allows for flexibility in airspace usage while still keeping safety standards in place.

For VFR pilots, flying in Class E airspace can occur without the necessity of a flight plan or ATC clearance. This is essential for promoting efficient and effective use of airspace, allowing both VFR and IFR (Instrument Flight Rules) operations to coexist without undue restrictions for pilots who are maintaining VFR.

The other options imply restrictions or requirements that do not accurately reflect the nature of Class E airspace. ATC communication is not a universal requirement in this class of airspace for VFR operations and thereby reinforces the idea that pilots can navigate with increased autonomy when conditions allow.