Correct answer - .ebextensions/<mysettings>.config : You can add AWS Elastic
Beanstalk configuration files (.ebextensions) to your web application's source code
to configure your environment and customize the AWS resources that it contains. Configuration
files are YAML- or JSON-formatted documents with a .config file extension that you place in a
folder named .ebextensions and deploy in your application source bundle.
Incorrect:
.ebextensions_<mysettings>.config - Place all of your configuration files in a
single folder, named .ebextensions, in the root of your source bundle
.config/<mysettings>.ebextensions - Configuration files must end with a
.config file extension
.config_<mysettings>.ebextensions - Place all of your configuration files in a
single folder, named .ebextensions, in the root of your source bundle.