You are working on a new project involving the creation of Lambda functions for a Serverless Web Application. A large team of developers will work on this project performing multiple changes to the Lambda function code. As the best practice, you have been asked to publish a version while creating a Lambda function or updating a function code. Which of the following is TRUE with regards to the published version of a Lambda Function?

Answer options:

A.A published version is a snapshot of function code and has the same version number when a previous version is deleted & recreated.
B.A published version is a snapshot of function code and has a unique Amazon Resource Name that can be updated using “UpdateFunctionCode.”
C.A published version is a snapshot of function code and configuration that can be updated using the “Publish” parameter.
D.A published version is a snapshot of function code and configuration that can`t be changed.

Correct Answer – D
A Publish version is a snapshot copy of a Lambda Function code & configuration in $LATEST version. No configuration changes can be done to a published version & it has a unique ARN which can’t be modified.
Option A is incorrect as a published version can only have a different version from previous ones, even when the previous version is deleted & recreated.
Option B is incorrect as after a version is published, ARN can’t be modified.
Option C is incorrect as when a version is published. No configuration changes can be made to this version.
For more information on AWS Lambda Versioning, refer to the following URL-
https://docs.aws.amazon.com/lambda/latest/dg/versioning-intro.html