What is the relationship between OSPF interface authentication and area authentication

The basic principles of OSPF authentication are as follows:

If authentication is configured on the interface, use the authentication on the interface. If null is configured on the interface, no authentication is performed on the interface. If no authentication is performed on the interface (Null does not mean that no authentication is configured), the authentication configured on the area is used. If no authentication is configured on the area, either, no authentication will be performed.

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