Which of the below 3 things can you achieve with the Cloudwatch logs service

Answer options:

A.Record API calls for your AWS account and delivers log files containing API calls to your Amazon S3 bucket
B.Send the log data to AWS Lambda for custom processing or to load into other systems
C.Stream the log data to Amazon Kinesis
D.Stream the log data into Amazon Elasticsearch in near real-time with CloudWatch Logs subscriptions.

Answer - B,C and D
You can use Amazon CloudWatch Logs to monitor, store, and access your log files from Amazon Elastic Compute Cloud (Amazon EC2) instances, AWS CloudTrail, and other sources. You can then retrieve the associated log data from CloudWatch Logs.
For more information on Cloudwatch logs, please visit the below URL:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/WhatIsCloudWatchLogs.html