Which of the following is a keto-enol tautomeric pair? 
Definitions:
Machine-Hours
A measure of production output or activity based on the number of hours machines are operated in the manufacturing process.
Auditor Hours
The total time spent by auditors reviewing and verifying the financial statements and records of an entity.
Predetermined Overhead Rate
A rate used to allocate manufacturing overhead costs to products, based on a predetermined formula.
Direct Materials
The raw materials that are directly incorporated into a finished product and can be directly attributed to the product.
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