Which of the following is a keto-enol tautomeric pair? 
Definitions:
Source Credibility
The level of trustworthiness, reliability, and expertise attributed to a source of information by its audience.
Expertise
How much a source knows.
Trustworthiness
Whether a source will honestly tell you what he or she knows.
Halo Effect
The assumption that because people have one desirable trait (e.g., attractiveness), they also possess many other desirable traits (e.g., intelligence).
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