Final answer:
A gp2 volume can be attached to only one instance at a time in Amazon Web Services (AWS) Elastic Block Store (EBS).
Step-by-step explanation:
A gp2 volume can be attached to only one instance at a time.
In Amazon Web Services (AWS), an gp2 volume is an Elastic Block Store (EBS) volume that provides block-level storage for EC2 instances. Each EC2 instance can attach multiple EBS volumes, but each EBS volume can be attached to only one instance at a time.
For example, if you have an EC2 instance with two gp2 volumes, you can attach one volume to the instance and keep the other volume detached. If you want to attach the second volume to a different instance, you need to detach it from the first instance and then attach it to the second instance.