Which task must a user perform by using the AWS account root user credentials?

Explanations:

While the root user has full permissions to make changes to AWS resources, it’s not a task that must be performed exclusively by the root user. IAM users can also be granted permissions to manage production resources.

Changing AWS Support plans is a task that must be performed using the root user credentials. This action requires root user permissions and cannot be done by IAM users.

Accessing AWS Cost and Usage Reports can be done by IAM users who have been granted the necessary permissions. It does not require root user credentials.

Granting access to auditors can be done by creating IAM users with specific permissions, and does not necessarily require the use of root user credentials. The root user can perform this, but it’s not a task that must be done by them.