A technician wants to keep a router up to date. Which of the following MUST be updated regularly?

The SSID (Service Set Identifier) is the network name and does not require regular updates for security or performance, although changing it periodically can be a minor security measure.

While the administrator password should be strong and changed periodically, it is a configuration setting, not a component that is 'updated' in the same sense as firmware.

Wireless encryption (e.g., WPA2, WPA3) should be configured securely, but the encryption standard itself isn't 'updated regularly' like software; rather, the most secure option should be consistently used.

Router firmware is the embedded software that controls the device's operations; regularly updating it is crucial for applying security patches, fixing bugs, improving performance, and adding new features, protecting the network from vulnerabilities. This ensures the router functions optimally and securely against emerging threats.