Which of the following is a storage encryption technology?

• A. Full disk encryption
• B. Network encryption
• C. Email encryption
• D. Password encryption

Answer: (A)

The main idea here is protecting data when it’s stored on a device, not while it’s moving or being read in specific applications. Full disk encryption safeguards data at rest by encrypting the entire disk or partition, so without the decryption key the information remains unread if the device is lost or stolen. This makes it storage encryption technology.

Other options target encryption in different contexts: encrypting data as it travels over a network keeps transmissions secure; encrypting emails protects message contents; encrypting passwords is about securing authentication data rather than the whole data store. So full disk encryption is the storage-focused choice.