A company wants to analyze and generate reports to track the usage of its mobile app. The app is popular and has a global user base. The company uses a custom report building program to analyze application usage.

The program generates multiple reports during the last week of each month. The program takes less than $10$ minutes to produce each report. The company rarely uses the program to generate reports outside of the last week of each month The company wants to generate reports in the least amount of time when the reports are requested.

Which solution will meet these requirements MOST cost$-$effectively?

A$.$ Run the program by using Amazon EC$2$ On$-$Demand Instances. Create an Amazon EventBridge rule to start the EC$2$ instances when reports are requested. Run the EC$2$ instances continuously during the last week of each month.

B$.$ Run the program in AWS Lambda. Create an Amazon EventBridge rule to run a Lambda function when reports are requested.

C$.$ Run the program in Amazon Elastic Container Service $($Amazon ECS$).$ Schedule Amazon ECS to run the program when reports are requested.

D$.$ Run the program by using Amazon EC$2$ Spot Instances. Create an Amazon EventBndge rule to start the EC$2$ instances when reports are requested. Run the EC$2$ instances continuously during the last week of each month.