You are building a language model by using a Language Understanding (classic) service. You create a new Language Understanding (classic) resource. You need to a...

You are building a language model by using a Language Understanding (classic) service.
You create a new Language Understanding (classic) resource.
You need to add more contributors.
What should you use?

A. a conditional access policy in Azure Active Directory (Azure AD) B. the Access control (IAM) page for the authoring resources in the Azure portal C. the Access control (IAM) page for the prediction resources in the Azure portal