A company hosts its web application on AWS using seven Amazon EC2 instances. The company requires that the IP addresses of all healthy EC2 instances be returned in response to DNS queries. Which policy should be used to meet this requirement?
C for correct
https://aws.amazon.com/premiumsupport/knowledge-center/multivalue-versus-simple-policies/:
"Use a multivalue answer routing policy to help distribute DNS responses across multiple resources. For example, use multivalue answer routing when you want to associate your routing records with a Route 53 health check."
Answer is C.
https://aws.amazon.com/premiumsupport/knowledge-center/multivalue-versus-simple-policies
Use a multivalue answer routing policy to help distribute DNS responses across multiple resources.
You can't use multiple records of the same name and type with simple routing. However, a single record can contain multiple values (such as IP addresses).
Use a multivalue answer routing policy to help distribute DNS responses across multiple resources. For example, use multivalue answer routing when you want to associate your routing records with a Route 53 health check. This use case only have one resource : EC2. So the answer is A.
Sorry, it's C. The reason is : Note: You can't attach a health check to a simple routing policy. Instead, Route 53 returns all values to the client regardless the status of an IP address. When an unhealthy IP address is returned, the user's client tries to connect to the unhealthy IP and the user experiences downtime.
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