Exam AZ-600 topic 2 question 5 discussion

Correct - A. Azure Partner Shared Services Azure Partner Shared Services (APSS) subscriptions are the preferred choice for registration when a direct CSP or a CSP distributor operates Azure Stack Hub. APSS subscriptions are associated with a shared-services tenant. When you register Azure Stack Hub, you provide credentials for an account that's an owner of the subscription. The account you use to register Azure Stack Hub can be different from the admin account that you use for deployment. Furthermore, the two accounts do not need to belong to the same domain; you can deploy using the tenant that you already use. For example, you can use ContosoCSP.onmicrosoft.com, then register using a different tenant; for example, IURContosoCSP.onmicrosoft.com. Remember to sign in using ContosoCSP.onmicrosoft.com when you perform daily Azure Stack Hub administration. You sign in to Azure using IURContosoCSP.onmicrosoft.com when you need to perform registration operations. CSP subscriptions CSP subscriptions are the preferred choice for registration when a CSP reseller or an end customer operates Azure Stack Hub. https://docs.microsoft.com/en-gb/learn/modules/manage-usage-billing-azure-stack-hub/5-usage-bill-multitenant-scenarios

A is the right answer.