Final answer:
To access an item in Azure Blob stored in the Archive tier, the access tier must change to Hot or Cool, after which a rehydration process occurs that can take hours or days based on the data size.
Step-by-step explanation:
Before an item stored in Azure Blob's Archive access tier can be accessed, it must first have its access tier changed. Specifically, you would need to change the access tier from 'Archive' to either 'Hot' or 'Cool', depending on your access needs. This change necessitates a rehydration process, where the data is moved to the selected tier. This process is not immediate; it can take several hours or even days before the data becomes accessible, depending on the size and amount of data being rehydrated. Once the transition is complete and the rehydration process has finished, you will be able to access the blob.