Final answer:
The service that would help consolidate billing between multiple AWS accounts is AWS Organizations. AWS Organizations enables you to centrally manage and govern multiple AWS accounts. The correct option is d.
Step-by-step explanation:
The service that would help consolidate billing between multiple AWS accounts is AWS Organizations. AWS Organizations enables you to centrally manage and govern multiple AWS accounts. It allows you to create a hierarchy of accounts, apply policies to enforce security and compliance standards, and consolidate billing for all the accounts in your organization.
For example, if you have multiple AWS accounts for different departments or business units, AWS Organizations can provide a consolidated view of billing across all the accounts, allowing you to track and manage costs more efficiently. On the other hand, AWS Cost Explorer is a tool that helps you visualize and analyze your AWS costs, but it doesn't have the ability to consolidate billing across multiple accounts. Hence, d is the correct option.