5 PB is correct. This value is the published maximum capacity for a single table storage account and it represents the upper storage limit you can place in one account for table service data.

The table service is part of a storage account and the account level capacity limit therefore governs how much table data you can store. The documented account limit is 5 PB and that is why this numeric option is the correct choice for the upper bound on table storage.

500 TB is incorrect because it is a lower figure than the actual account capacity limit and does not match the documented maximum for a table storage account.

Cloud Bigtable is incorrect because it is the name of a managed NoSQL database service and not a numeric storage limit. It is also a different vendor service and therefore it does not answer the question about an account capacity value.

Unlimited is incorrect because storage accounts have documented capacity limits and they are not unlimited. The correct limit is a finite maximum which is the 5 PB value given above.

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