The flight director manages the flight controllers who work in the Mission Control Center. Flight director make sures the International Space Station is operated safely or not. He leads the planning and coordination of all activities. He approves any procedures to protect the space station and crew. Thus the correct option is D.
The GC team is responsible for the ground systems infrastructure and ground communications necessary to perform planning, training, testing, execution and evaluation of human spaceflight mission operations.
Capcoms represent both the technical control team on the ground and astronauts in orbit.
A mission control center is a facility that manages space flights, usually from the point of launch until landing or the end of the mission. It is part of the ground segment of spacecraft operations.
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