Platform configuration register (PCR) hash: A PCR hash is versatile memory that stores data hashes for the sealing function. Sealing, on the other hand, "seals" the system state to a particular hardware and software configuration.

When resources are running in a cloud environment, the BEST disaster recovery solution is typically the Cloud provider BCDR (Business Continuity and Disaster Recovery) option, which is option B.

Dynamic analysis involves testing the application while it is running to identify vulnerabilities present during execution, providing the most exhaustive runtime vulnerability detection. Input validation is a specific security control, not a method for exhaustive testing. Side-channel analysis examines unintended information leakage but does not comprehensively assess runtime vulnerabilities.
Fuzz testing is a specific technique within dynamic analysis but does not ensure exhaustive coverage. Static analysis examines code without execution, missing runtime-specific vulnerabilities.

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.