Consider the following cost-volume-profit graph: 
The area designated by the letter (C) represents which of the following?
Definitions:
Oligodendrocytes
Glial cells in the central nervous system that produce myelin, a substance that insulates nerve fibers and speeds up signal transmission.
Schwann Cells
A type of glial cell located in the peripheral nervous system that is essential for the maintenance of nerve fibers and the formation of myelin.
Myelin
A fatty substance that surrounds and insulates the axons of many neurons, facilitating the rapid transmission of electrical impulses.
Reticular Formation
An extensive network of neurons located in the brainstem, playing a key role in controlling arousal, attention, and sleep-wake cycles.
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