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A security administrator wants to enable a feature that would prevent a compromised encryption key from being used to decrypt all the VPN traffic. Which of the following should the security administrator use?
Correct Answer: D
Perfect Forward Secrecy (PFS) is a feature of certain key agreement protocols that ensures a session key derived from a set of long-term keys cannot be compromised if one of the long-term keys is compromised in the future. In the context of a VPN, PFS ensures that each session has a unique encryption key, and even if a key is compromised, it will not compromise past or future VPN sessions.