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How should you provision your Compute Engine instances when migrating a proof-of-concept application to production to increase availability and enable autoscaling, given that the initial deployment used manually placed instances in a single zone?
A
Create a single managed instance group, specify the desired region, and select Multiple zones for the location.
B
Create a managed instance group for each region, select Single zone for the location, and manually distribute instances across the zones in that region.
C
Create an unmanaged instance group in a single zone, and then create an HTTP load balancer for the instance group.
D
Create an unmanaged instance group for each zone, and manually distribute the instances across the desired zones.