What is the width of Class D airspace typically?

Class D airspace is designed to manage aviation operations in areas surrounding airports that have air traffic control services. Typically, the dimensions of Class D airspace are defined as extending from the surface to a specific height, usually 2,500 feet above ground level (AGL). Furthermore, it extends horizontally in a specific radius around the airport, which is commonly 4 nautical miles (NM).

The correct answer encompasses both critical dimensions: the vertical limit of 2,500 feet AGL and the horizontal radius of 4 NM. This makes the option indicating that both dimensions are correct the most appropriate, as it accurately reflects the standards for Class D airspace. Understanding this allows pilots and air traffic controllers to effectively manage air traffic in these zones, ensuring safety and coordination during takeoffs and landings in busy airport regions.