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Which of the following processes involves a user entering credentials one time and being able to access all the resources allowed to the user:
Single sign on (SSO)
Kerberos
Least Privileges
Smart Card
This question is ambiguous as Kerberos also offers access to all allowed resources based on initial authentication by the Kerberos server. Where Kerberos differs is that the authentication 'ticket' is only valid for 10 hours or less. SSO session cookies stay live until logout. The question could be re-worded to reflect this but would probably drop too much of a hint to the answer.
Kerberos is a subset of SSO. Although it does provide SSO functionality, so does OAuth and SAML, so Kerberos is not a complete answer. SSO is the only answer here that covers all technologies that provide this functionality
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