What is the role of disaggregation in controller-based networking?

What is the role of disaggregation in controller-based networking?

A. It divides the control-plane and data-plane functions. B. It streamlines traffic handling by assigning individual devices to perform either Layer 2 or Layer 3 functions C. It summarizes the routes between the core and distribution layers of the network topology D. It enables a network topology to quickly adjust from a ring network to a star network