Who is permitted access to the security restricted area?

Access to the security-restricted area is granted to individuals who possess valid identification that properly identifies their purpose for being in that area. This includes both passengers who have a boarding card, affirming their intent to fly, as well as crew members who have their official identification (crew IDs). These credentials are essential for security measures, as they ensure that only authorized individuals are allowed in spaces where security protocols are particularly stringent.

The other options do not encompass the necessary combination of identification that provides appropriate clearance. For instance, while boarding cards or airport ID may grant access, having only one type of identification does not account for the comprehensive security needs of the area. Hence, the inclusion of both boarding cards and crew IDs together ensures that the requisite security standards are met.