You have an Azure Active Directory (Azure AD) tenant named contoso.com. You need to ensure that Azure AD External Identities pricing is based on monthly active users (MAU). What should you configure? 

Answer options:

A. a user flow
B. the terms of use
C. a linked subscription
D. an access review

C

Reference: https://docs.microsoft.com/en-us/azure/active-directory/external-identities/external-identities-pricing