Which of the following is the best way to update an S3 notification configuration when a change in the lambda version needs to be referred by an S3 bucket after new objects are created in the bucket?

Answer options:

A.Specify Lambda Alias ARN in the notification configuration.
B.Specify Lambda Function ARN in the notification configuration.
C.Specify Lambda Qualified ARN in the notification configuration.
D.Specify Lambda $LATEST ARN in the notification configuration.

Correct Answer – A
When a Lambda Alias ARN is used in the notification configuration & a new version of the Lambda function is created, you need to update Alias ARN pointing to a new function. No changes are required to be done at the Amazon S3 bucket.
Option B is incorrect. When a Lambda Function ARN is used in the notification configuration, whenever there is a new Lambda Function created, you will need to update ARN in notification configuration to point to the latest version.
Option C is incorrect when a Lambda Qualified ARN is used in the notification configuration. Whenever there is a new Lambda Function created, you will need to update ARN in the notification configuration to point to the latest version.
Option D is incorrect as there is nothing as $LATEST ARN. $LATEST version has two ARN associated with it, Qualified ARN & Unqualified ARN.
For more information on AWS Lambda Aliases, refer to the following URL-
https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html