Restricted Areas are parts of the airport designated by the airport operator and posted for security reasons; these areas are part of the Security Identification Display Area (SIDA).

• A. Security Identification Display Area (SIDA)
• B. Public Areas
• C. Sterile Areas
• D. Ramp Areas

Answer: (A)

Restricted areas are the security‑controlled parts of the airport that are designated by the airport operator and posted for safety. They are governed by the Security Identification Display Area (SIDA), meaning only people who have the proper SIDA badge and display it as required can enter. The badge system is what makes these zones off‑limits to unauthorized personnel and helps security quickly verify who is allowed airside. Public areas are outside security, so they don’t require SIDA access. Sterile areas are restricted after security screening for passengers and authorized personnel, and ramp areas refer to the airside movement zones around aircraft; both require proper authorization, but the link described in the statement is specifically that restricted areas belong to SIDA.