Which of the following is a keto-enol tautomeric pair? 
Definitions:
Activity-Based Costing
An accounting method that allocates costs to products or services based on the activities and resources consumed in the production or delivery process.
Overhead Assignment
The process of allocating indirect costs (or overheads) to various cost objects such as products, projects, or departments.
Product Cost
The total expenses incurred to produce and prepare a product for sale, including materials, labor, and overhead.
Activity-Based Costing
An accounting method that assigns costs to products or services based on the activities they require, improving accuracy in assigning costs.
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