A famous CRM solution provider has its data stored in Azure Data Lake Storage. The total data size is 25 TB. You must ensure data redundancy in a way that, if the region on which the data is stored goes through an outage, the data should be available immediately in another region. Also, the solution should be cost-effective. 
You plan to use Local Redundant (LRS). Will this solve the issue?

Answer options:

A.Yes
B.No

Correct Answer: B 
When you use geo-redundant storage, the data is copied to a secondary region as well. Similarly, Read Access Geo-redundant storage also does the same, but in a cost-effective manner. The limitation with this is that the data in the secondary region will be available only for reading, 
So RA-GRS will be the right choice.
But LRS will have data in the primary region only. So, in case of an outage, the data will not be accessible. 
Reference: 
For more details on column store indexes, please refer to the following document

https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy