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 DNS query responses. Which Route 53 routing policy should be used to meet this requirement?

The Multivalue routing policy is designed to return multiple healthy records in response to DNS queries. When associated with health checks, Route 53 will only return the IP addresses of healthy EC2 instances, satisfying the requirement to return all healthy instances. Simple routing policy returns a single record and does not incorporate health checks. Latency routing policy routes traffic to the resource with the lowest latency, not necessarily all healthy instances. Geolocation routing policy routes traffic based on the user's geographic location, which is not the requirement here.