What feature must be enabled to prevent unauthorized access to sensitive information during data transmission?

To prevent unauthorized access to sensitive information during data transmission, enabling encryption is essential. Encryption transforms data into a coded format that is unreadable to anyone who does not possess the appropriate decryption key. This ensures that even if the data is intercepted during transmission, it remains secure and inaccessible to unauthorized parties.

Encryption plays a critical role in protecting sensitive information by maintaining confidentiality. It is widely used in various applications, such as secure web browsing through HTTPS, email encryption, and file encryption. This helps organizations meet compliance requirements and protect data integrity.

While other features such as IPSec, VPN access, and firewall rules contribute to securing data and network traffic, they do not specifically focus on the protection of data during transmission in the same manner that encryption does. IPSec may help secure communications between devices at a network level, VPN access allows secure connections to remote networks, and firewall rules manage inbound and outbound traffic, but none provide the same level of protection for the actual content of the data being transmitted as encryption does.