The following diagram is an evolutionary tree showing the relationship between the three domains.Which letter represents the most recent common ancestor of the Bacteria and Archaea? 
Definitions:
Actuator
A device that produces mechanical motion in response to an electrical, air, or hydraulic signal.
Pilot Operated
A system or valve controlled indirectly through the use of a smaller, pilot valve rather than directly by mechanical means.
Flow Control
The regulation and management of the rate or volume of flow in a system, such as fluids in pipelines or data over networks, to meet certain conditions or requirements.
Directional Control
The mechanism or system used to steer or change the direction of a vehicle or a machine part.
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