Card 17 / 125: Which is a true statement? choose all what apply
A) In Bidirectional-layered systems, the interaction between layers is always initiated by the higher layer
B) Uni-directional Layering is also refered as strict layering
C) In Uni-directional Layering, the services are flowing from lower to upper layers
D) In unidirectional-layered systems, an entity at layer N can only interact with entities at layers N+1 and N-1 and no other layers

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