A Developer Created an AWS Lambda Function and Has Asked

Multiple Choice

A Developer created an AWS Lambda function and has asked the SysOps Administrator to make this function run every 15 minutes. What is the MOST efficient way to accomplish this request?

A) Create an Amazon EC2 instance and schedule a cron to invoke the Lambda function.
B) Create a Repeat Time variable inside the Lambda function to invoke the Lamdba function.
C) Create a second Lambda function to monitor and invoke the first Lamdba function.
D) Create an Amazon CloudWatch scheduled event to invoke the Lambda function.