Final answer:
To encrypt data at rest, both Client-side encryption and Azure Storage Service Encryption (SSE) methods can be used. Client-side encryption encrypts the data before sending it to the storage, while SSE automatically encrypts the data within Azure storage.
Step-by-step explanation:
The ways to encrypt data at rest include Client-side encryption and Azure Storage Service Encryption (SSE). Client-side encryption involves encrypting data before it is sent to the storage service. The encryption process takes place on the client's side, and the data remains encrypted throughout the transmission and at rest. Azure Storage Service Encryption (SSE) is a feature provided by Azure that automatically encrypts data as it is being written to Azure storage and decrypts the data as it is being retrieved. The correct answer to the question is C) Both, as both methods are valid ways to encrypt data at rest.