A sysops administrator has an AWS Lambda function that performs maintenance on various AWS resources. This function must be run nightly.
Which is the MOST cost-effective solution?
A . Launch a single t2.nano Amazon EC2 instance and create a Linux cron job to invoke the Lambda function at the same time every night.
B . Set up an Amazon CloudWatch metrics alarm to invoke the Lambda function at the same time every night.
C . Schedule a CloudWatch event to invoke the Lambda function at the same time every night.
D . Implement a Chef recipe in AWS OpsWorks stack to invoke the Lambda function at the same time every night.
Answer: C