What is the main benefit of splitting the core network into separate user-plane and control-plane nodes?

What is the main benefit of splitting the core network into separate user-plane and control-plane nodes?
A . Independent configuration of user-plane and control-plane nodes
B . Independent scaling of user-plane and control-plane nodes
C . User of a shared data repository for storing user states.
D . Creation of networks with isolated properties over a common infrastructure

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Answer: B