You want to deploy a fleet of identical web servers that automatically scale up when CPU utilization exceeds 70%. If a server crashes, it should be automatically recreated.

What is the correct sequence of steps to configure this in Compute Engine?

Create a Managed Instance Group (MIG), then create an Instance Template, and attach it to the MIG.

Create an Unmanaged Instance Group, add existing VMs to it, and configure an autoscaler.

Create an Instance Template, then create a Managed Instance Group (MIG) using that template, and configure autoscaling based on CPU utilization.

Create a snapshot of an existing VM, create a MIG from the snapshot, and enable autohealing.