As per following Microsoft document, Premium block blogs support both LRS and ZRS
https://learn.microsoft.com/en-us/azure/storage/common/storage-account-overview
key word "only" according to this link https://learn.microsoft.com/en-us/azure/storage/common/storage-account-overview ZRS is supported is some region not at all, then LRS would be the answer
2 ZRS, GZRS, and RA-GZRS are available only for standard general-purpose v2, premium block blobs, and premium file shares accounts in certain regions. For more information, see Azure Storage redundancy.
Badly written question which only permits one answer
* Block blob storage accounts support locally redundant storage (LRS) and zone redundant storage (ZRS) in CERTAIN regions.
* So it will support LRS in all regions and ZRS in some regions.
* So this leaves LRS as the commin denominator for all regions
SEGUN LO QUE HE LEIDO LA RESPUESTA CORRECTA ES GRS
https://learn.microsoft.com/en-us/azure/templates/microsoft.storage/storageaccounts?pivots=deployment-language-bicep
ZRS is supported for premium block blobs accounts.
Look under Premium blobn accounts on the microsoft page:
https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy
Azure Premium Disk Storage currently supports only locally redundant storage (LRS). Block blob storage accounts support locally redundant storage (LRS) and zone redundant storage (ZRS) in certain regions
As an example if you select the region "Canada Central", LRS is the only redundancy option available for all the premium options page blobs, block blobs and file shares.
Should support both LRS and ZRS redundancy but ZRS is not available in all regions https://learn.microsoft.com/en-us/azure/storage/common/storage-account-overview#types-of-storage-accounts
LRS ist Correct Answear:
ZRS - premium block blobs, and premium file shares accounts in certain regions.
https://learn.microsoft.com/en-us/azure/storage/common/storage-account-overview
ZRS is supported for premium block blobs accounts. For more information about premium block blobs, see Premium block blob storage accounts.
https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy#geo-redundant-storage
"Block blob storage accounts support locally redundant storage (LRS)". And "zone redundant storage (ZRS) in certain regions." So the correct answer should be LRS for all regions by default.
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