[Solved] categories : A)groups B)causes C)locations D)sizes Hardwired Electromechanical: Refers to devices directly connected and controlled via mechanical and electrical components without software intervention. Master Control Relay: A main relay used in electrical or automation systems to control the operation of multiple circuits or systems. Enclosure: A steel box with a removable cover or hinged door used to house electric equipment. Watchdog Error: An error condition triggered by a watchdog timer, which monitors system or process activity to ensure it is operating within expected norms, indicating malfunctions or failures.