Which of the following events is a threat? This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option. option A A thunderstorm that interrupts commercial electrical power option B A network firewall that malfunctions, sporadically blocking some but not all traffic, due to its power supply overheating option C A systems administrator who leaves their workstation logged in to their privileged account, while they take a coffee break option D A user who copies data that they do not need for work$-$related tasks onto a removable storage device