The partition specifies how Azure storage load balances entities, messages, and blobs across servers to achieve the traffic requirements of these objects. Which of the following represents the partition key for a blob?

Answer options:

A.Account name + Table Name + blob name
B.Account name + container name + blob name
C.Account name + Queue name + blob name
D.Account Name + Table Name + Partition Key
E.Account Name + Queue Name

Correct Answer: B 
For a blob, the partition key consists of account name + container name + blob name. Data is partitioned into ranges using these partition keys and these ranges are load balanced throughout the system.
Option A is incorrect. For a blob, the partition key includes account name + container name + blob name.
Option B is correct. For a blob, the partition key includes account name + container name + blob name.
Option C is incorrect. Account name + Queue name + blob name is not the right partition key for a blob.
Option D is incorrect. For an entity in a table, the partition key includes the table name and the partition key.
Option E is incorrect. For a message in a queue, the queue name is the partition key itself.
Reference:
To know more about Partitioning Azure Blob Storage, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/architecture/best-practices/data-partitioning-strategies