What type of security system restricts access to unauthorized users at certain times?

The choice of access control highlights a vital aspect of security systems designed to manage who can enter specific areas and when. Access control systems serve a critical function in security management by allowing or denying entry to individuals based on predetermined criteria, such as time, identity, or access rights.

These systems often integrate physical elements like keycards or biometric scanners with administrative features that define the times during which users have permissions. For example, an employee might have access to certain areas during business hours but not at night or on weekends. This capability is essential for maintaining security in sensitive environments, such as workplaces and facilities that require tight security measures.

In contrast, a surveillance system primarily focuses on monitoring and recording activities within a designated area but does not inherently provide restrictions on access. Alarm systems generally focus on detecting breaches and alerting authorities rather than managing who can access certain locations. Monitoring systems can gather data and observations but do not specifically control access based on timing. Overall, access control is the best choice for systems that enforce restrictions on access to unauthorized users at specific times.