A water treatment facility classifies its operational technology (OT) network as critical infrastructure. Which approach BEST represents converged physical-cyber resilience for this environment?
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A
Air-gapped OT network with physically controlled jump servers and logged USB usage for data transfer
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B
Directly connecting OT devices to the corporate IT network to simplify monitoring
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C
Encrypting all PLC-to-HMI communications using TLS 1.3 without physical access controls
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D
Allowing remote vendor access via shared VPN credentials to reduce operational costs