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dependency or association??

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Can someone please clarify the following question?

1. Consider a Flight Management system that manages the assignment of flights to FlightSchedule for an airline. The FlightSchedule class has add(f:Flight) and remove(f:Flight) methods defined in it. What is the relationship between FlightSchedule and Flight classes?
a). Generalization relationship
b). Composition relationship
c). Inheritance relationship
d). Dependency relationship
e). Association relationship

(select 1 correct answer)
what will be the ans..??
whizlabs says-association relationship..
some posts in Object by design forum say -composition relationship'
i say - dependency Relationship
whats the correct ans..??

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