Identify the C3 epimer of the sugar below drawn in its open chain (acyclic) Fischer projection. 
Definitions:
Competitive
Relating to or characterized by competition; having the ability or resources to compete successfully with others.
Imperfectly Competitive
A market structure characterized by few sellers, differentiated products, and barriers to entry, which does not meet the criteria of perfect competition.
Monopoly
A market structure characterized by a single supplier that has exclusive control over a good or service, potentially leading to higher prices and restricted output.
Demand Schedule
A table that shows the quantity of a good or service that consumers are willing and able to purchase at various prices.
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