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.