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Explanation: The four classes of threats are as follows:

Hardware threats – physical damage to servers, routers, switches, cabling plant, and workstations

Environmental threats – temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry)

Electrical threats – voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss

Maintenance threats – poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling, and poor labeling