Transmission security is a type of Technical safeguard designed to protect data in transit. Data in transit means:

• A. At rest
• B. In transit across networks
• C. In backups
• D. In physical form

Answer: (B)

Transmission security focuses on protecting information while it is being sent from one place to another over networks. Data in transit refers to data that is actively moving across networks—think emails traveling between servers, web pages loading in your browser, file transfers, or API calls between systems. This is the state that requires encryption and secure transfer methods to prevent eavesdropping, tampering, or interception.

Data at rest, by contrast, is information stored on storage media and not moving, so it uses different protections. Backups are copies of data that are typically stored rather than continuously moving; they may be moved or transferred at times, but the term doesn’t define the ongoing state of data in motion. Physical form refers to non-digital records, like paper documents. Since the question targets data actively moving across networks, the correct characterization is data in transit across networks.