Final answer:
To restore an Amazon EBS volume, all snapshots are required along with the most recent snapshot.
Step-by-step explanation:
In order to restore an Amazon EBS volume, you need to have the most recent snapshot along with all the previous snapshots. So the correct answer is 3) All snapshots.
When restoring an EBS volume, you start with the most recent snapshot and then apply the changes stored in each subsequent snapshot until you have restored the volume to the desired state.
For example, if you have three snapshots - Snapshot A (first one), Snapshot B, and Snapshot C (most recent one) - you would need all three snapshots to fully restore the EBS volume.