Which area requires valid authorization for access, according to security measures?

The Security Identification Display Area (SIDA) is the correct answer because it is specifically designated as an area where access is strictly controlled for security reasons. Individuals entering the SIDA must have valid authorization, which typically involves proper identification and a badge that indicates their clearance level. This measure is in place to help prevent unauthorized access and ensure the security of aircraft, airport operations, and passengers.

In contrast, the Movement Area includes runways and taxiways where aircraft are actually moving, but access controls may vary; it often requires specific training and communication protocols rather than generalized access authorization like the SIDA. The Public Access Area consists of spaces that are readily accessible to the general public, so no special authorization is required for entry. The General Aviation Area pertains to sections of the airport that serve private or non-commercial flights, which may have different security protocols not as stringent as those of the SIDA.