Which Salesforce feature should be used to debug the issue?

A university is planning to set up an identity solution for its alumni. A third-party identity provider will be used for single sign-on Salesforce will be the system of records. Users are getting error messages when logging in.

Which Salesforce feature should be used to debug the issue?
A . Apex Exception Email
B. View Setup Audit Trail
C. Debug Logs
D. Login History

Answer: D