What is the typical ceiling and floor representation for layers of airspace in Class B?

In Class B airspace, the typical representation of ceilings and floors is expressed as specific numerical values indicating feet above mean sea level (MSL). This is important for pilots to understand as it provides clear guidance on the vertical limits of the airspace. For example, Class B airspace is usually structured with a defined ceiling that may extend up to 10,000 feet MSL, with a floor that can start from the surface or a specified altitude, depending on the design of the airspace around busy airports. These specific altitude numbers ensure that pilots can maintain safe distances from the ground and other air traffic, thereby facilitating an organized flow of aircraft in congested areas.

Other options, such as relative altitude comparisons or percentages, do not provide the defined and unambiguous information necessary for effective navigation and air traffic management within the Class B airspace, making them less effective in practical scenarios.