Which of the following provides the BEST level of security for data traveling across a WAN?

Data destruction is about making data irrecoverable, which is not applicable to protecting data in transit.

Key Management is crucial for encryption but does not directly secure the data itself; it secures the keys used for encryption and decryption.

Authentication verifies the identity of users or systems, but it does not protect the data's confidentiality once the connection is established or if data is captured.

Encryption transforms data into an unreadable format, protecting its confidentiality even if intercepted during transit across a WAN. This process ensures that only authorized parties with the correct decryption key can access the original information.