What security control did the company lack that led to the server outage when an employee unplugged the power cable?

The correct answer highlights the absence of a physical security control, which is crucial in safeguarding against inadvertent actions that could disrupt vital systems, such as an employee unintentionally unplugging a power cable. Physical security controls are measures designed to prevent unauthorized physical access to facilities, equipment, and resources. In this case, a simple physical barrier, such as a lockable server rack or a designated access point for server maintenance, could have prevented the employee from easily accessing the power cable.

When organizations overlook physical security measures, they expose themselves to risks stemming from human error or negligence. The absence of appropriate safeguards allows for easily preventable disruptions, leading to significant operational downtime and impact on business continuity. Therefore, emphasizing physical security controls is essential, as they are the front line of defense protecting critical infrastructure from both intentional and accidental disruptions.