A logical unit of Azure services that is linked to an Azure account. Billing for Azure services is done on a per-__________ basis. If your account is the only account associated with a __________, then you are responsible for billing. __________s help you organize access to cloud service resources. They also help you control how resource usage is reported, billed, and paid for. Each one can have a different billing and payment setup, so you can have different __________s and different plans by department, project, regional office, and so on. Every cloud service belongs to a __________, and the __________ ID may be required for programmatic operations.