In the evolutionary tree below,which of the nodes corresponds to the MOST recent common ancestor of troodontids,dromaeosaurids,and Archaeopteryx? 
Definitions:
Total Revenue
The total amount of money generated by the sale of goods or services before any costs are subtracted.
Output Level
The amount of products or services generated by a company or economic system within a specified timeframe.
Marginal Revenue
The additional income earned from selling one more unit of a good or service.
Output
The volume of output in terms of products or services from a business, sector, or country within a designated timeframe.
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