Approaching Livermore Class D airspace while under a northeast wind requires that a pilot do what if visibility is 2-1/2 miles?

In Class D airspace, which is designed to protect airport operations and the aircraft within that airspace, pilots are required to maintain certain visibility and cloud clearance criteria. In this scenario, with a northeast wind and visibility of 2-1/2 miles, the action of staying below 700 feet allows a pilot to remain in uncontrolled airspace (Class G). This would let the pilot operate without needing to adhere to the communication requirements of the Class D airspace if they are below the specified altitude.

Typically, Class D airspace starts at 3,000 feet or higher above ground level, and below this altitude, pilots need to communicate with Air Traffic Control (ATC). By operating below 700 feet in Class G airspace, the pilot is also able to land as long as they can maintain visual conditions, making this option viable in terms of both the airspace regulations and operational safety.

The other options involve maintaining a different altitude or communication with ATC, which may not be necessary if the pilot can successfully navigate and land while staying in Class G airspace due to adequate visibility conditions.