Match the type of threat with the cause. $($Not all options are used.$)$a$)$ hardware threats b$)$ environmental threatsc$)$ electrical threats d$)$ maintenance threats$1)$ poor handling of key electrical components $($electrostatic discharge$)$ lack of critical spare parts, poor cabling, and labeling$\mathrm{.}2)$ unauthorized access resulting in loss of data$\mathrm{.}3)$ temperature extremes $($too hot or too cold$)$ or humidity extremes $($too wet or too dry$)\mathrm{.}4)$ physical damage to servers, routers, switches, cabling plant, and workstations$\mathrm{.}5)$ voltage spikes, insufficient supply voltage $($brownouts$),$ unconditioned power $($noise$),$ and total power loss.