What is required to trace Lambda-based applications with AWS X-Ray?

A. Send logs from the Lambda application to an S3 bucket; trigger a Lambda function from the bucket to send data to AWS X-Ray.
B. Trigger a Lambda function from the application logs in Amazon CloudWatch to submit tracing data to AWS X-Ray.
C. Use an IAM execution role to give the Lambda function permissions and enable tracing.
D. Update and add AWS X-Ray daemon code to relevant parts of the Lambda function to set up the trace.