Final answer:
In a general-purpose v2 Azure Storage account, you are charged for not just the storage but also the read and write operations, which are billed per operation.
Step-by-step explanation:
When you use a general-purpose v2 Azure Storage account, the costs include not only the amount of data stored but also the operations on that data. The correct answer to your question is (b) Charged per operation. This means that every time you perform a read or write operation, there is a cost associated with it, in addition to the storage cost. This cost-per-operation model enables you to pay only for what you use in terms of both storage and access, which can be advantageous for varying workloads. Therefore, while storing data incurs a monthly fee based on the amount of data stored, actions such as listing the contents of a container, reading a blob, or writing data to a blob also incur transaction charges.