Final answer:
The service port interface is used for maintenance purposes on a WLC and can be used to recover the WLC in case of failure. Thus, option (b) is correct.
Step-by-step explanation:
The service port interface is a physical interface on the WLC that is used for maintenance purposes and can be used to recover the WLC in the event of a failure. It is typically used for initial setup and troubleshooting.
For example, if the WLC's management interface is not accessible, a technician can still connect to the WLC using the service port interface to perform maintenance tasks and recover the WLC.
To summarize, the service port interface is the physical interface on the WLC that is used for maintenance and recovery purposes.
Learn more about Service Port Interface