Audit objects to check who updated the Flexfields' Contact in the Account level

Summary:

Could someone please let me know which object and attribute should be enabled under Manage audit policies to check who updated or inserted the flexfields' Contact in the Account level.

Navigation to the page is : Receivables -> Billing -> Manage Customers -> Search for the customer -> Accounts → Communications →Account contacts.

Content (please ensure you mask any confidential information):

I'm not able to find flexfields's attributes for audit policy account's contacts at receivable account level

Version (include the version you are using, if applicable):

25A (11.13.25.01.0)