What occurs during piggybacking at a security door?

Piggybacking at a security door refers to the scenario where one person follows another into a secure area without proper authorization, typically by closely trailing behind them as the door opens. The essence of piggybacking lies in the unauthorized entry of multiple individuals into a secure space, which is highlighted by the option that states more than one employee enters without proper identification.

In this situation, the first individual may have legitimate access by presenting their identification, but subsequent individuals exploit this opportunity to gain access without going through the proper security protocols. This poses a significant security risk, as it undermines the effectiveness of identification checks and can lead to unauthorized individuals entering sensitive areas.

The other options presented either imply compliant behaviors with security protocols or involve scenarios that don't align with the concept of piggybacking, which focuses on unauthorized access rather than credible entry procedures.