Consolidated billing is the correct answer because when managing accounts under a single administrative structure, such as with the service in question, all costs from the individual subscriptions are compiled into one bill for the management subscription. This streamlines the billing process, potentially qualifies the entity for bulk pricing discounts, and simplifies tracking and paying for services used across the entire organization. The incorrect answers are misleading: resources are not shared by default, Marketplace purchases do not automatically receive volume discounts solely from using a centralized administrative service, and usage limits are not set across accounts automatically.