Which of the following structures is consistent with the IR spectra shown below? 
Definitions:
Raw Materials Inventory
The stock of basic materials and components that are to be used in the production or manufacturing of goods.
Labor Rate Variance
The difference between the actual cost of labor and the expected (or budgeted) cost, often analyzed in cost accounting.
Labor Efficiency Variance
A metric that assesses the difference in actual versus budgeted labor hours used, valued at the standard wage rate, to gauge workforce productivity.
Work in Process Account
An account that tracks the costs associated with partially completed goods in the manufacturing process.
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