Your application currently points to several Lambda functions in AWS. A change is being made to one of the Lambda functions. You need to ensure that application traffic is shifted slowly from one Lambda function to the other. Which of the following steps would you carry out?
Select 2 Options.

Answer options:

A.Create an ALIAS with the –routing-config parameter.
B.Update the ALIAS with the –routing-config parameter.
C.Create a version with the –routing-config parameter.
D.Update the version with the –routing-config parameter.
E.Update the function with the - config parameter.

Answer – A and B
This is mentioned in the AWS Documentation.
By default, an alias points to a single Lambda function version. When the alias is updated to point to a different function version, incoming request traffic instantly points to the updated version. This exposes that alias to any potential instabilities introduced by the new version. To minimize this impact, you can implement the routing-config parameter of the Lambda alias that allows you to point to two different versions of the Lambda function and dictate what percentage of incoming traffic is sent to each version.
Options C and D are incorrect since you need to use ALIAS for this purpose.
Option E is incorrect because A & B are the correct ways to achieve the requirement.
For more information on shifting traffic using ALIAS, please refer to the below URL-
https://docs.aws.amazon.com/lambda/latest/dg/lambda-traffic-shifting-using-aliases.html