You work in a video game company, and your team is working on a feature that tells how many times certain web pages have been viewed or clicked. You also created an AWS Lambda function to show some key statistics of the data. You tested the Lambda function, and it worked perfectly.

Answer options:

A.Create an AWS CloudWatch Events rule that is scheduled using a cron expression. Configure the target as the Lambda function.
B.Create an Amazon Linux EC2 T2 instance and set up a Cron job using Crontab. Use AWS CLI to call your AWS Lambda every 8:00 AM.
C.Use Amazon Batch to set up a job with a job definition that runs every 8:00 AM for the Lambda function.
D.In AWS CloudWatch Events console, click “Create Event” using the cron expression “ * ? * * 08 00”. Configure the target as the Lambda function.

Correct Answer– A
Potentially, more than one option may work. However, this question asks the most cost-efficient and straightforward method that needs to be considered.
Option A is CORRECT because the AWS CloudWatch Events rule is free and quite easy to begin with. To schedule a daily event at 8:00 AM GMT, you just need to set up a cron rule, as given in the below screenshot.
Option B is incorrect: Because launching a new EC2 instance for this task is not cost-efficient.
Option C is incorrect: Because this is not something AWS Batch works. For AWS Batch, it runs as a containerized application on an Amazon EC2 instance in your computing environment.
Option D is incorrect: Because firstly, it should be “Create rule” rather than “Create Event”. Secondly, the Cron expression of “ * ? * * 08 00” is incorrect.
For More information, Please check below AWS Docs: 
https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html