How does NSX simplify physical network design?

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How does NSX simplify physical network design?

A. VLANs are moved into the virtual network for virtual machine traffic, eliminating the need to use PVLANs on the physical network.
B. Network administrators only need to configure routing on the physical network for virtual machine traffic since all other network functions are moved to the virtual network.
C. Transport zones are created in the virtual network for virtual machine traffic, removing the need to make changes to the physical network.
D. Virtual network integration can make changes to the physical network programmatically using REST API calls which automates network changes and increases agility.