Final answer:
To ensure the highest availability of storage data and protect against region-wide outages, Geo-redundant storage is the recommended option, with Read-access geo-redundant storage being an even higher level of availability.
Step-by-step explanation:
If you want to provide the highest availability to your storage data and protect against a region-wide outage, the redundancy option you should choose is Geo-redundant storage. This type of redundancy ensures that your data is replicated in a geographical location that is distant from the primary location, thus safeguarding against regional disasters. For even higher availability, you might consider Read-access geo-redundant storage, which allows for read access to the replica in the secondary location, even if the primary location is unavailable.