What condition is designated when a terrorist attack has just occurred in an immediate area?

The correct choice indicates a condition of FPCON Delta, which is utilized when there is a known, specific, and imminent threat of terrorist activity. In this scenario, a terrorist attack has just occurred in the immediate area, which triggers the most stringent level of protective measures. This condition reflects the highest state of alert and readiness, necessitating immediate responses to further threats and ensuring the safety of personnel and assets.

FPCON Delta requires increased security measures, including access control and heightened awareness, to address the immediate threat effectively and minimize potential casualties or damage. This designation is critical for responding quickly to protect personnel and facilities in the wake of a terrorist incident.