Which of the following is true regarding the flexibility of closed access control systems?

Closed access control systems are designed with specific functions and hardware, which means that their architecture does not support easy changes or integrations with new technologies or devices. This inherent limitation is what leads to the characterization of such systems as offering limited options for expansion. When compared to open systems, which are typically more flexible and can integrate additional devices and features, closed systems require more effort and resources to modify or upgrade.

The other options, while appealing in concept, do not accurately reflect the nature of closed access control systems. They usually do not adapt easily to new integrations, lack the capability to update features automatically, and are often tailored to specific technologies or applications rather than being universally user-friendly across different environments. As a result, the flexibility of closed access control systems is indeed constrained, primarily impacting their ability to expand or integrate with other systems and tools effectively.