Which of the following best describes the concept of coordination in language?

A、Coordinationconnectsunitsthataresemanticallyrelatedandofequalhierarchicalstatus.
B、Coordinationinvolvesconnectingunitsthatareofdifferenthierarchicallevels.
C、Coordinationreferstotheuseofsubordinationinsentencestructures.
D、Coordinationonlyappliestonounsanddoesnotincludeverbsoradjectives.