Final answer:
Data on an Amazon EBS volume restored from a snapshot is available immediately, although initial read operations will trigger loading data on demand, which can affect performance until all the data is loaded.
Step-by-step explanation:
When you are restoring an Amazon Elastic Block Store (Amazon EBS) volume from a snapshot, the data on the volume is available immediately (B. The data will be available immediately). However, the newly-created volume operates on a lazy-load basis, meaning that the data is loaded on demand when accessed for the first time. This means there can be some initial performance impact until all the data is fully loaded. The performance and the time it takes to access the data initially do not depend on the provisioned size of the volume, the amount of data stored, or whether the attached instance is EBS-optimized.