[Solved] What happens in a Layers of Abstraction pattern?

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Q.	What happens in a Layers of Abstraction pattern?
A.	each layer uses services in the layer immediately below it.
B.	each layer uses services in the layer immediately above it.
C.	each layer uses services in the layers immediately above it and below it.
D.	each layer is independent of the other layers.
Answer» A. each layer uses services in the layer immediately below it.

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