Which best practice for cost governance does this example show?

Explanations:

Resource controls refer to limiting the resources that can be used or accessed, which is not directly related to the optimization of workloads through specific AWS services.

Cost allocation involves assigning costs to different services or projects for better tracking and reporting. While this is important for governance, it does not specifically address improving efficiency and reducing costs through specific service use.

Architecture optimization involves refining the design and utilization of cloud resources to enhance efficiency and reduce costs. By using specific AWS services effectively, the company demonstrates this best practice.

Tagging enforcement relates to ensuring that resources are properly tagged for identification and tracking purposes. While important for governance, it does not directly imply the strategic use of specific services to improve efficiency and reduce costs.