What anatomy is labeled as letter A in the image below? 
Definitions:
Total Profit
The overall financial gain made by a business after subtracting all costs from the total revenue generated from its operations.
AVC
Average Variable Cost; the total variable cost divided by the quantity of output produced.
ATC
Stands for "Average Total Cost," which refers to the total cost divided by the quantity of goods produced, in economics.
ATC Curve
Represents the average total cost of production at different levels of output, illustrating how cost per unit changes with changes in output.
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