Option A is a joke, right? Security tape? Come on, we're talking about air conditioning equipment here, not a middle school locker. Let's keep it serious, folks.
D is the way to go. Physical locks with a limited set of keys under constant supervision by a guard is the most secure option. You can't beat human oversight when it comes to protecting sensitive equipment.
I'd go with B. Electrical contacts that log each open and close event to a secure system memory would give you a detailed record of who's been accessing the equipment. That kind of audit trail is crucial.
Option C seems like the most comprehensive solution to protect the air conditioning equipment. Magnetic contacts that are permanently alarmed and connected to the security control-room panels would be a great way to monitor and secure the doors.
Emilio
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