Understanding Provider information

Trying to wrap my head around this, but what is the difference between:

1. Network WAN IP
2. Carrier WAN IP
3. Customer WAN IP 4z LAN Block

Please let me know if I am not understanding this

1. This is the CE interface that faces the boundary device
2. This is the PE interface facing the CE
3. The interface facing the CE interface (can be the outside interface of either a fw or router/ boundary device that separates the LAN)
4. I’m confused with this one.