What are the correct terms of the following descriptions of underlays and overlay networks?

What are the correct terms of the following descriptions of underlays and overlay networks?
A . Underlay is logically isolated from overlay, and as long as the routes between tunnel endpoints are reachable, the failure of the underlay network will not directly affect the overlay network
B . Overlay Routes for the network are generated by routes that are ingested into the underlay network
C . When implementing the overlay technology in the underlay network, the original underlay network needs to be modified to a certain extent
D . From the perspective of an overlay network, the underlay network is transparent to devices connected outside of the VXLAN tunnel endpoints

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Answer: A D