A cloud administrator needs to implement a mechanism to monitor the expense of the company's cloud resources. Which of the following is the BEST option to execute this task with minimal effort?

Requesting daily reports from the cloud provider is a manual and reactive process that does not provide real-time monitoring or automated analysis, requiring more operational effort than a purpose-built tool.

Custom budget threshold notifications are reactive alerts that only trigger when a limit is exceeded and do not provide the proactive, comprehensive cost analysis and trend reporting needed for full expense monitoring.

Using the API to collect expense information requires custom development, scripting, and ongoing maintenance to build and sustain the monitoring pipeline, which involves significantly more effort than a pre-built financial tool.

Cloud-native financial management tools such as AWS Cost Explorer, Azure Cost Management, or Google Cloud Billing provide built-in dashboards, cost allocation, trend analysis, and reporting specifically designed for cloud resource expense monitoring. These tools require minimal configuration and deliver continuous visibility without custom development or manual intervention. They represent the most comprehensive and lowest-effort solution for sustained cloud expense management.