Which AWS service helps in managing multi-account strategies?

The service that specifically helps in managing multi-account strategies is Amazon Organizations. This service enables users to centrally manage policies across multiple AWS accounts. It streamlines account management and provides a framework for organizational governance. Amazon Organizations allows you to create and manage organizational units, consolidate billing, apply service control policies, and manage permissions across various accounts in a more effective way.

With Amazon Organizations, you can simplify your billing processes with consolidated billing and allocate costs across different accounts, making it easier to provide cost visibility and accountability. Additionally, the service aids in setting policies that can restrict what services can be accessed and how they can be used across the organization.

While other services listed, such as Amazon Control Tower, AWS IAM, and Amazon VPC, focus on aspects of account setup, permissions, or virtual networking, they do not specifically address the overarching management framework for multiple AWS accounts like Amazon Organizations does, making it the right choice for this scenario.