Refer to the exhibit.
An engineer is designing a guest portal on Cisco ISE using the default configuration. During the testing phase, the engineer receives a warning when displaying the guest portal.
Which issue is occurring?
A . The server that is providing the portal has an expired certificate
B . The server that is providing the portal has a self-signed certificate
C . The connection is using an unsupported protocol
D . The connection is using an unsupported browser
Answer: B