How can an EBS volume that is currently attached to an EC2 instance be migrated from one Availability Zone to another?

A. Simply create a new volume in the other AZ and specify the original volume as the source.
B. Detach the volume, then use the ec2-migrate-volume command to move it to another AZ.
C. Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ.
D. Detach the volume and attach it to another EC2 instance in the other AZ.