Identify the four basic categories of hardware in a personal computer system.

Hard disk, input$/$output$,$ secondary storage, and display devices

System unit, input$/$output$,$ secondary storage, and primary storage

System unit, input$/$output$,$ secondary storage, and communication

Hard disk, modem, RAM, and microprocessor

Which one of the following is not considered a form of secondary storage?

Solid$-$state storage

Optical discs

RAM

Hard disk