What should a solutions architect do to meet these requirements?

Explanations:

In the management account, activating the costCenter tag allows all member accounts to report the costs associated with this tag across the organization. Configuring monthly AWS Cost and Usage Reports in the management account and using the tag breakdown will accurately capture the costs for the costCenter tagged resources, which meets the requirement for accurate cost calculation for compliance resources.

Activating the costCenter tag only in member accounts limits tag-based cost tracking visibility at the management account level. Additionally, setting up a Lambda function to retrieve and calculate the cost could introduce inaccuracies and add unnecessary complexity.

Activating the costCenter tag only in member accounts does not allow consolidated tracking of costs at the management account level. This approach misses the tag visibility across the organization, reducing accuracy in cost tracking.

AWS Trusted Advisor does not provide detailed cost reports or tag-based breakdowns, so using it would not allow accurate calculation of costs associated with the costCenter tagged resources. Trusted Advisor focuses more on security, optimization, and best practices rather than detailed billing breakdowns.