Managed instance group reports failures creating new instances. You must maintain the group size defined by the instance template to handle expected traffic. What should you do?

The correct answer addresses two common reasons for instance creation failures in Managed Instance Groups (MIGs): an invalid instance template and naming conflicts. A MIG uses an instance template to create new instances. If the template is invalid, instance creation will fail. Additionally, if a persistent disk with the same name as a new instance already exists in the project, the instance creation will fail because disk names must be unique within a project. Deleting conflicting persistent disks resolves this. The other options are incorrect because: "Verify instance name and persistent disk name values in the template are not identical" is not the primary issue; the conflict arises when a pre-existing disk has the same name as a new instance. "Set disks.autoDelete to true in the template" is a good practice for ephemeral disks but doesn't resolve the immediate instance creation failure due to naming conflicts or an invalid template. "Delete the current instance template and replace it with a new one" is an unnecessary step if the existing template can be updated, and it doesn't directly address the disk naming conflict.