The correct answer is: D. All of the above
A graph plotter is a computer output device that produces hard copy graphs and charts. It is used to create graphical representations of data, such as line graphs, bar graphs, and pie charts.
A teletype terminal is a computer input/output device that allows users to interact with a computer by typing text and seeing the results of their commands on a paper printout. It is also known as a teleprinter or teletypewriter.
A line printer is a computer output device that prints text one line at a time. It is used to produce large amounts of printed output, such as reports, invoices, and mailing lists.
All of these devices can be used for both input and output. For example, a graph plotter can be used to create a graph of data that is input from a computer, or it can be used to print a graph that is created by the user. A teletype terminal can be used to enter data into a computer, or it can be used to display the results of computer commands. A line printer can be used to print data that is output from a computer, or it can be used to create a hard copy of a document that is created by the user.