Correct answer - "EC2 User Data" : When you launch an instance in Amazon EC2, you have the option
of passing user data to the instance that can be used to perform common automated configuration
tasks and even run scripts after the instance starts. A use case for user data would be if you
run web servers for various small businesses, they can all use the same AMI and retrieve their
content from the Amazon S3 bucket you specify in the user data at launch.
"Mount EFS network drives" - Amazon EFS is a file storage service for use with Amazon EC2 that
can provide storage for up to thousands of Amazon EC2 instances. EFS does not provide
instructions but instead a storage service
"EC2 Meta Data" - Meta Data is information about your running instance, for example you can
access information such as the local IP address of your instance
"Custom AMI" - With a Custom AMI you can pre-install software and configure your Operating System
to have all it needs before launching. If you were using User Data, you would have software or
other tasks that you can specify when the instance launches but may take longer to boot so a
Custom AMI can be recommended.