Your company is currently planning on using Route53 for managing Blue Green deployments. They have already setup an 80%-20% for a new deployment. How can you disable traffic to the older setup once all testing is complete?

Answer options:

A.Delete the weighted resource record
B.Change the resource record to a simple routing policy
C.Change the resource record weight to 100
D.Change the resource record weight to 0

Answer – D
The AWS Documentation mentions the following to support this answer
Enter an integer between 0 and 255. To disable routing to a resource, set Weight to 0. If you set Weight to 0 for all of the records in the group, traffic is routed to all resources with equal probability. This ensures that you don`t accidentally disable routing for a group of weighted records.
Options A and B are incorrect since you need to first mark the resource record as 0
Option C is incorrect because this will cause the reverse and all traffic will flow to the application
For more information on setting values for the weighted resource records , please refer to the below URL
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-values-weighted.html