Where can a system administrator go if they are trying to determine why a user cannot log in to Salesforce? (Select all that apply)

Where can a system administrator go if they are trying to determine why a user cannot log in to Salesforce? (Select all that apply)
A . The Login History related list on the user’s record
B . The user’s profile
C . Manage Users | Login History
D . Call salesforce.com Support

Answer: A, C