In Oracle Credit Management how the "Assign Customer Credit Classification program" works?

Q1. At what level the Credit Classifications will be updated Customer Profile Class level or Party Level or Account Level or Account Site Level?

Below is the extract from Credit Management Use guide

Assign Customer Credit Classification Program

Use the Assign Customer Credit Classification program to add or update the credit classification on a customer.

Use this program when you first begin using credit classifications, or whenever you want to update multiple customers at once.

Otherwise, assign the credit classification at the customer profile class level, or at the customer or address level.

Selected Parameters

* Profile Class Name	=
* Credit Classification