A company runs over 20 applications in a single VPC using EC2, ECS, and RDS. Three engineering teams each own multiple applications, and resources are tagged for application and team. The company uses IAM for daily access. The finance team needs to identify monthly AWS costs per application and per team, produce 12-month historical comparison reports, and forecast costs for the next 12 months. Which combination of actions will provide these cost reports? (Choose three.)

To identify monthly costs per application and team, activate user-defined cost allocation tags for application and team. This allows you to filter and group costs by these custom dimensions in Cost Explorer. AWS-generated tags are predefined and do not include custom application or team tags. Creating cost categories in Billing and Cost Management allows for grouping and categorizing costs based on specific rules, which can be used to organize costs by application for reporting. Enabling Cost Explorer is essential as it provides the interface and tools for visualizing, understanding, and managing AWS costs, including historical analysis and forecasting capabilities. While enabling IAM access to Billing and Cost Management is necessary for users to view these reports, it doesn't directly generate the reports. Creating a cost budget helps monitor spending against a threshold but doesn't provide the detailed historical or forecasted cost breakdown requested.