Which instance characteristics are required if an Administrator wants to ensure use of the Amazon EC2 auto-recovery option?

Explanations:

The auto-recovery option is available for EC2 instances with EBS (Elastic Block Store) volumes only. Instances that have EBS root volumes can benefit from the auto-recovery feature, which allows them to be automatically rebooted if they become impaired.

Instances with EC2 Instance Store root volumes cannot use the auto-recovery option. The instance store is ephemeral storage that is physically attached to the host server, and if the instance fails, the data on the instance store is lost and the instance cannot be automatically recovered.

The tenancy attribute set to “default” (shared tenancy) is compatible with the auto-recovery option. Auto-recovery is available for instances that run in a shared tenancy environment, allowing the system to take advantage of the EC2 infrastructure to recover instances.

The “Dedicated” tenancy attribute is not supported for the auto-recovery feature. Dedicated instances run on hardware that’s dedicated to a single customer, and while they can be rebooted, they do not support the automatic recovery option due to the specific infrastructure requirements and limitations.

The instance types belonging to the d2, i2, or i3 categories do not inherently determine the availability of the auto-recovery feature. Auto-recovery can be utilized for various instance types that meet other criteria, such as having EBS volumes and appropriate tenancy, and is not limited to specific instance types.